toán lớp 5 q2

nhien thu'dng Ia so th�p phan - Viet dau phay vao ben phai so thuong.. nhien cho so th�p ph an - fem chu so hang th�p phan cua so chia roi viet vao ben phai so b!. nhien thu'dng Ia so t

1 ae u c h o h QC T6 m¢t c6 1 hai 1 2 em 56

to hai n h�n dlfQ'C nh ieu hon 0 t6 m9t li:f 1 4 vien Hoi moi to n h � n duqc bao n h ieu

vien kE;o?

Bai 1 60 M<)t khoi h9c si n h tham gia dong dien Neu x ep 1 2 em m¢t han g thl th ua

6 em Neu xep 1 4 em m¢t ha ng thl ding thU'a 6 em n hun g ft· cfi 2 hang Hoi c6

bao nhieu hqc sinh tham g ia dong dien?

-Rise above oneself

a n d gras p the world

I

A N-HAN SO TH � P PHAN

- Lam tlnh nhlf Ia n han cac so tV nhien

- f)�t dau phay d tkh cu ng v! tri v6'i dau

N ha n so th�p p h a n voi 1 0; 1 00; 1 000; tuc Ia dai dau phay sang phai 1 ; 2; 3; chG' so ttio'ng ung

Vi d':J 2: 3,1 871 X 1 00 = 3 1 8, 7 1

3 Nhan so th�p phan v6i so th�p phan

- N han n h ll n han cac so tl! nhit�n

- sa hang th�p phan Ci tkh bang tong so

hang th�p p h a n d cac thua so

4 N han so th�p phan v6'i 0,1 ; 0,0 1 ; o,oo 1 ;

Vi d�;� 3: 1 ,24 X 3,6 = ?

1 ,24

X 3,6 + 744

372 4,464

N ha n so thc}p phan voi 0,1 ; 0,0 1 ; 0,001 ; tuc Ia doi dau phay sa ng trai 1 ; 2; 3;

chu so tuong ling

1 ae u c h o h QC T6 m¢t c6 1 hai 1 2 em 56

to hai n h�n dlfQ'C nh ieu hon 0 t6 m9t li:f 1 4 vien Hoi moi to n h � n duqc bao n h ieu

vien kE;o?

Bai 1 60 M<)t khoi h9c si n h tham gia dong dien Neu x ep 1 2 em m¢t han g thl th ua

6 em Neu xep 1 4 em m¢t ha ng thl ding thU'a 6 em n hun g ft· cfi 2 hang Hoi c6

bao nhieu hqc sinh tham g ia dong dien?

-Rise above oneself

a n d gras p the world

I

A N-HAN SO TH � P PHAN

- Lam tlnh nhlf Ia n han cac so tV nhien

- f)�t dau phay d tkh cu ng v! tri v6'i dau

N ha n so th�p p h a n voi 1 0; 1 00; 1 000; tuc Ia dai dau phay sang phai 1 ; 2; 3; chG' so ttio'ng ung

Vi d':J 2: 3,1 871 X 1 00 = 3 1 8, 7 1

3 Nhan so th�p phan v6i so th�p phan

- N han n h ll n han cac so tl! nhit�n

- sa hang th�p phan Ci tkh bang tong so

hang th�p p h a n d cac thua so

4 N han so th�p phan v6'i 0,1 ; 0,0 1 ; o,oo 1 ;

Vi d�;� 3: 1 ,24 X 3,6 = ?

1 ,24

X 3,6 + 744

372 4,464

N ha n so thc}p phan voi 0,1 ; 0,0 1 ; 0,001 ; tuc Ia doi dau phay sa ng trai 1 ; 2; 3;

chu so tuong ling

ARCHIMEDES SCHOOL

B (HIA SO TH�P PHAN

1 Chia so th�p phan cho so ty' n hh�n

.- Tn toc .het chia ph�n nguyen cho so do ­

-: Viet dau phay vao ben phai thu'ong

tr�oc khi lay chu so aau tiE�n (J phan th�p

phan ct}a s6 bj chia�

- Tiep tttc chia phan th�p phan cho

2 Chi a so tl! nhh�n cho so tl! nhien (thu'dng Ia so th�p phan)

- Viet dau phay vao ben phai so thuong

- Viet them mqt chu so 0 vao b e n p h a i so

duva ti�l? tvc chia

- Neu p hep chia van con dv thl viet them

m¢t cha so 0 vao ben phai so du' va tiep

tyc chi a

3 Chia so tl! nhien cho so th�p ph an

- f)em chu so hang th�p phan cua so chia

roi viet vao ben phai so b! chia cung m¢t

chu so o

- 86 dau phay 0 so chia roi chia nhli chia

hai so ttj n h it�n

4 Chi a so th�p ph an cho so th�p phan

� Bern xem co baa nhieu cha so (1 ph�n

th� p phan cua s6 chia thl chuyen dau

phay (j so bi chia sang ben phai bay

nhiE�u chu so

- Bo dau phay (J sO chia roi thlfc hi�n

phep chi a nhu chia cho so tV nhien

5 Chia so th�p phan cho 1 0; 1 00; 1 000;

Rise above oneself

and grasp the world

Toah s -Quyen 2.1

Bai 1 56 M9t ddn Vi b¢ d9i can sang $6ng N�u moi thuyen chd 1 5 ngV6'i thl thlta

40 nguoi chua duqc sang song Neu moi thuyen ch6 20 ng uoi thl con thua 1 thuyen Hoi c6 bao nh!eu thuyef} va dan vi b9 d9i d6 co bao nh ieu nguai?

Bai i 57 M¢t nh6m b�n ru nhau di hai qua hong Neu moi b�h 5 qua thl thua 11 qual neu moi b�n 6 qua thl m¢t b9n khong hai duc;;c qua nao Hoi nh6m c6 bao nhieu b�Hi

Va hai OU(JC bao nhieu q u a hong?

Bfd 1 58 M¢t to xe c6 m¢t so xe tai, neu moi xe cho 1 5 bao 990 thl con thieu 1 xe, neu moi xe chO' 10 bao 990 th1 f9i th ua 1 xe Hoi to co may xe tai va dt,t d�nh ch6' bao

nhieu bao g?o?

Archi m edes School

Aschoo l edu.vn

ARCHIMEDES SCHOOL

B (HIA SO TH�P PHAN

1 Chia so th�p phan cho so ty' n hh�n

.- Tn toc .het chia ph�n nguyen cho so do ­

-: Viet dau phay vao ben phai thu'ong

tr�oc khi lay chu so aau tiE�n (J phan th�p

phan ct}a s6 bj chia�

- Tiep tttc chia phan th�p phan cho

2 Chi a so tl! nhh�n cho so tl! nhien (thu'dng Ia so th�p phan)

- Viet dau phay vao ben phai so thuong

- Viet them mqt chu so 0 vao b e n p h a i so

duva ti�l? tvc chia

- Neu p hep chia van con dv thl viet them

m¢t cha so 0 vao ben phai so du' va tiep

tyc chi a

3 Chia so tl! nhien cho so th�p ph an

- f)em chu so hang th�p phan cua so chia

roi viet vao ben phai so b! chia cung m¢t

chu so o

- 86 dau phay 0 so chia roi chia nhli chia

hai so ttj n h it�n

4 Chi a so th�p ph an cho so th�p phan

� Bern xem co baa nhieu cha so (1 ph�n

th� p phan cua s6 chia thl chuyen dau

phay (j so bi chia sang ben phai bay

nhiE�u chu so

- Bo dau phay (J sO chia roi thlfc hi�n

phep chi a nhu chia cho so tV nhien

5 Chia so th�p phan cho 1 0; 1 00; 1 000;

Rise above oneself

and grasp the world

Toah s -Quyen 2.1

Bai 1 56 M9t ddn Vi b¢ d9i can sang $6ng N�u moi thuyen chd 1 5 ngV6'i thl thlta

40 nguoi chua duqc sang song Neu moi thuyen ch6 20 ng uoi thl con thua 1 thuyen Hoi c6 bao nh!eu thuyef} va dan vi b9 d9i d6 co bao nh ieu nguai?

Bai i 57 M¢t nh6m b�n ru nhau di hai qua hong Neu moi b�h 5 qua thl thua 11 qual neu moi b�n 6 qua thl m¢t b9n khong hai duc;;c qua nao Hoi nh6m c6 bao nhieu b�Hi

Va hai OU(JC bao nhieu q u a hong?

Bfd 1 58 M¢t to xe c6 m¢t so xe tai, neu moi xe cho 1 5 bao 990 thl con thieu 1 xe, neu moi xe chO' 10 bao 990 th1 f9i th ua 1 xe Hoi to co may xe tai va dt,t d�nh ch6' bao

nhieu bao g?o?

Archi m edes School

Aschoo l edu.vn

Bai 1 54 0 m()t phong hQp, neu moi bim ngoi 3 nguoi thl 1 7 nguoi chua c6 cho ng6i,

neu moi ban ngoi 4 nguai thl 2 nguoi chua c6 cho ngoi Hoi c6 bao n hieu nguai dlf

hQp va bao nhh�u ban?

Bfd 1 55 0 m()t l&p hQC, neu x�p _moi bim } b�n thi con thua 8 b9n chu'a co cho ngoil

neu xep moi bzm 5 b�n thl thlia 2 ban Hoi lop c6 bao nhi<�u hQC sinh va bao nhh�u ban ?

I Rise a bove o neself and grasp the world

Bai 1 54 0 m()t phong hQp, neu moi bim ngoi 3 nguoi thl 1 7 nguoi chua c6 cho ng6i,

neu moi ban ngoi 4 nguai thl 2 nguoi chua c6 cho ngoi Hoi c6 bao n hieu nguai dlf

hQp va bao nhh�u ban?

Bfd 1 55 0 m()t l&p hQC, neu x�p _moi bim } b�n thi con thua 8 b9n chu'a co cho ngoil

neu xep moi bzm 5 b�n thl thlia 2 ban Hoi lop c6 bao nhi<�u hQC sinh va bao nhh�u ban ?

I Rise a bove o neself and grasp the world

6 1 Rise above oneself

a nd g rasp the world

d) 20,5 x 4,7 -20� 5 x 4,6

h) 1 2, 4 x 52 - 1 24 x 4�2

j) 0, 8 x 23,6 x 3 -4, 8 x 1, 8

Toan s - Quyen 2.1 _

· Bai 1 SO Bac Tan thu hoc;lch xoai va cho vao hqp dem di ban Neu moi h<)p chua

9 qua thl con thua 8 qua, con moi h(>p 1 2 q ua thl thieu 4 qua Hoi bac Tan thu hor?ch au'<;lc bao n hieu qua xoai?

Bai 1 51 Trong m9t d<;tt th u ho�ch th6c, neu chia moi bao 35kg thl con thua 77kg, con neu chia moi bao 40kg thl con thua 22kg Hoi dQt <16 thu hoc;lch alJQ'C baa nhh?u ki-lo-gam th6c?

B�ti 1 52 Hai c6 m{>t so bi va mqt so tui Neu Hai bo vao moi tui S vien bi thl thua

1 2 vh�n, neu b6 vao m6i tui 1 1 vien bi thl vua au Hoi Hai c6 bao nhieu vien bt, c6 bao nhieu tui?

Archi medes School Aschool.edu.vn

6 1 Rise above oneself

a nd g rasp the world

d) 20,5 x 4,7 -20� 5 x 4,6

h) 1 2, 4 x 52 - 1 24 x 4�2

j) 0, 8 x 23,6 x 3 -4, 8 x 1, 8

Toan s - Quyen 2.1 _

· Bai 1 SO Bac Tan thu hoc;lch xoai va cho vao hqp dem di ban Neu moi h<)p chua

9 qua thl con thua 8 qua, con moi h(>p 1 2 q ua thl thieu 4 qua Hoi bac Tan thu hor?ch au'<;lc bao n hieu qua xoai?

Bai 1 51 Trong m9t d<;tt th u ho�ch th6c, neu chia moi bao 35kg thl con thua 77kg, con neu chia moi bao 40kg thl con thua 22kg Hoi dQt <16 thu hoc;lch alJQ'C baa nhh?u ki-lo-gam th6c?

B�ti 1 52 Hai c6 m{>t so bi va mqt so tui Neu Hai bo vao moi tui S vien bi thl thua

1 2 vh�n, neu b6 vao m6i tui 1 1 vien bi thl vua au Hoi Hai c6 bao nhieu vien bt, c6 bao nhieu tui?

Archi medes School Aschool.edu.vn

Lop m ua Neu m ua 4 q 90

q uyen1 neu moi b9-n 6 q uyen t hl vl.ra het Hoi so va lap SA au<;Jc m ua Ia bao n hieu

quyen?

B a i 148 An h chia tao cho cac ems neu chia moi em 6 qua thi thua 7 qua, neu chia

moi em 9 qua thl con thieu 2 qua Hoi c6 bao nhieu qua tao va bao nhieu em dU'Q'c

chia tao?

Bid 1 49 M¢t oia hang ban 990 Neu chia mo� tui 1 7kg thl thieu 20kg, neu chia moi

tui 20kg thl thieu 80kg Hoi cua hang c6 bao nhieu ki-lo-gam g�o va dU'Q'C chia vao

bao nhit�u tui? (moi tui co so 990 bang nhau)

Rise a bove oneself

g rasp the world

.:!2:(3-�]=2,5 1 2 5 y

1 c) 1 -( 1,1 + y) : a10 = 0

Bid 6 Tim Y� bh�t:

a) y x 3,6 + y x 6, 4 = 1 81 9

Bai 7 Tfnh nhanh:

a) 3 x (36, 2 -6, 5�) + 7 x 36, 2 + 3 x 0, 52

1 b) 1, 5 x y : 2 = 2-

7

2 2 d) (y + 4) : 0, 5 + 1-:- = 1 3-

Lop m ua Neu m ua 4 q 90

q uyen1 neu moi b9-n 6 q uyen t hl vl.ra het Hoi so va lap SA au<;Jc m ua Ia bao n hieu

quyen?

B a i 148 An h chia tao cho cac ems neu chia moi em 6 qua thi thua 7 qua, neu chia

moi em 9 qua thl con thieu 2 qua Hoi c6 bao nhieu qua tao va bao nhieu em dU'Q'c

chia tao?

Bid 1 49 M¢t oia hang ban 990 Neu chia mo� tui 1 7kg thl thieu 20kg, neu chia moi

tui 20kg thl thieu 80kg Hoi cua hang c6 bao nhieu ki-lo-gam g�o va dU'Q'C chia vao

bao nhit�u tui? (moi tui co so 990 bang nhau)

Rise a bove oneself

g rasp the world

.:!2:(3-�]=2,5 1 2 5 y

1 c) 1 -( 1,1 + y) : a10 = 0

Bid 6 Tim Y� bh�t:

a) y x 3,6 + y x 6, 4 = 1 81 9

Bai 7 Tfnh nhanh:

a) 3 x (36, 2 -6, 5�) + 7 x 36, 2 + 3 x 0, 52

1 b) 1, 5 x y : 2 = 2-

7

2 2 d) (y + 4) : 0, 5 + 1-:- = 1 3-

ARCHIMEDES SCHOOL

b) 258,93 x(76; 1-14,3) � 1 58, 93 x (72 +4, 1)+ 258,93 x 1 4,3

· c) 1 5,2 x 34, 5 + 1 5, 2 x 471 5 + 84, 8 x 82

d) 497,625 - 2 1 5;46 x(2 x 1 5, 9 - 6)+ 2 1 5, 46 x 2 x 1 5, 9 - 2 1 5,46 x 6

Bid 8 Trung b1nh moi phut 6 to di duqc t2km Hoi 6 to d6 di 45km het"bao lau?

Bai 9 Hai thung c6 tat ca 2 1 4,5 1ft dau Sau khi do 1 0,5 l it d au tv thung thu nhatsang

thung.thu hai thl so dau (J thu ng thu n hat b�ng � so dau b thung thu hai Hoi ltk

3 dau moi thung c6 bao nhieu 1ft dau?

8 1· Rise a bove oneself

and grasp the world

I LY THUYET

BAI 3: HAl H IEU SO

1 Cac bliO.c giai d�ng bai t�p hai hi�u so Buac T: Tofll tat bai toan

Bciac 2: llm hi�u thanh ph an

Buac 3:1lm hi�u tong

Buac 4: Tam thanh ph an

Butte 5: Tim tong

3 q uy�n /em : thua 4 quyen

4 quyen/em : thieu 4 quyen

Bai giai

Chenh l�ch so v& m¢t em giua 2 each chia Ia: 4 - 3 = 1 (quyen) Chenh l�ch tong so vo du chia g iua 2 each chia Ia: 4 + 4 = 8 (quyen)

(c6 the sa dvng sa do de xac djnh hi�u tong)

56 hoc sinh Ia: 8 ; 1 = 8 (em) Tong so vo co giao chia Ia: 8 X 3 + 4 = 28 (quyen)

fla p so: 8 em, 28 qu yen vC:J

· - II LUY�N T�P

-oai 1-46� -ch! chia k�o cho cac em, neu moi em 6 chiec thl thua 4 chiec, neu moi em

8 chiec thi thiE�u 6 chiec H6i c6 bao nhieu chiec k�o va baa nhieu em d uq2 'chia ��o?

Archi medes School Aschool.edu.vn

ARCHIMEDES SCHOOL

b) 258,93 x(76; 1-14,3) � 1 58, 93 x (72 +4, 1)+ 258,93 x 1 4,3

· c) 1 5,2 x 34, 5 + 1 5, 2 x 471 5 + 84, 8 x 82

d) 497,625 - 2 1 5;46 x(2 x 1 5, 9 - 6)+ 2 1 5, 46 x 2 x 1 5, 9 - 2 1 5,46 x 6

Bid 8 Trung b1nh moi phut 6 to di duqc t2km Hoi 6 to d6 di 45km het"bao lau?

Bai 9 Hai thung c6 tat ca 2 1 4,5 1ft dau Sau khi do 1 0,5 l it d au tv thung thu nhatsang

thung.thu hai thl so dau (J thu ng thu n hat b�ng � so dau b thung thu hai Hoi ltk

3 dau moi thung c6 bao nhieu 1ft dau?

8 1· Rise a bove oneself

and grasp the world

I LY THUYET

BAI 3: HAl H IEU SO

1 Cac bliO.c giai d�ng bai t�p hai hi�u so Buac T: Tofll tat bai toan

Bciac 2: llm hi�u thanh ph an

Buac 3:1lm hi�u tong

Buac 4: Tam thanh ph an

Butte 5: Tim tong

3 q uy�n /em : thua 4 quyen

4 quyen/em : thieu 4 quyen

Bai giai

Chenh l�ch so v& m¢t em giua 2 each chia Ia: 4 - 3 = 1 (quyen) Chenh l�ch tong so vo du chia g iua 2 each chia Ia: 4 + 4 = 8 (quyen)

(c6 the sa dvng sa do de xac djnh hi�u tong)

56 hoc sinh Ia: 8 ; 1 = 8 (em) Tong so vo co giao chia Ia: 8 X 3 + 4 = 28 (quyen)

fla p so: 8 em, 28 qu yen vC:J

· - II LUY�N T�P

-oai 1-46� -ch! chia k�o cho cac em, neu moi em 6 chiec thl thua 4 chiec, neu moi em

8 chiec thi thiE�u 6 chiec H6i c6 bao nhieu chiec k�o va baa nhieu em d uq2 'chia ��o?

Archi medes School Aschool.edu.vn

40% Ia n a m kl I I, them 1 b�n n a m va 4 b � n n v n e n so b � n n a m ba ng 60o/o s6 b�n nO' Hoi dau nam h9c

Bid 1 44 i M9t g ia sa c h c6 3 n gan So sa h & ngan thu n ha t bang 66�_<vo so sach b

nga n thlt ba 56 sach 6 ngan thd' hai bang 75o/o so sach a nga n thu n hat Hoi gia c6

- tat ca bao nhteu quyen sach? Biet rang ngan thu ba nhieu han ngah thd' hai I a

45 quyen sach

Ba i 1 45 Trang s6 hQc sinh tham g ia lao a¢n g buoi sang, 40% Ia hqc sinh lop 61

36o/o Ia hQC sinh lop 7, so 'hQC sinh con 1<;1i I a hQC sinh lap 8 Buoi chieu, so hQC sinh lop

6 giam 75°/o, so hQc sinh lop 1 tang 25%, so hQc sinh lop 8 tang 75% Hoi so h9c sinh

tham gia lao d¢ng buoi chieu tang hay g ia m bao- nhieu pha.n tram so voi so hQc sinh

lao a¢ ng buoi sang?

Rise a bove oneself

a n d g rasp the world

40% Ia n a m kl I I, them 1 b�n n a m va 4 b � n n v n e n so b � n n a m ba ng 60o/o s6 b�n nO' Hoi dau nam h9c

lop n hiE�u

Bid 1 44 i M9t g ia sa c h c6 3 n gan So sa h & ngan thu n ha t bang 66�_<vo so sach b

nga n thlt ba 56 sach 6 ngan thd' hai bang 75o/o so sach a nga n thu n hat Hoi gia c6

- tat ca bao nhteu quyen sach? Biet rang ngan thu ba nhieu han ngah thd' hai I a

45 quyen sach

Ba i 1 45 Trang s6 hQc sinh tham g ia lao a¢n g buoi sang, 40% Ia hqc sinh lop 61

36o/o Ia hQC sinh lop 7, so 'hQC sinh con 1<;1i I a hQC sinh lap 8 Buoi chieu, so hQC sinh lop

6 giam 75°/o, so hQc sinh lop 1 tang 25%, so hQc sinh lop 8 tang 75% Hoi so h9c sinh

tham gia lao d¢ng buoi chieu tang hay g ia m bao- nhieu pha.n tram so voi so hQc sinh

lao a¢ ng buoi sang?

Rise a bove oneself

a n d g rasp the world

· ARCH I M EDES SCHOOL

Bai 1 2 Cho day so; _1 , t ; 2, 2; 3r3; � · ; 1 qs,9; 1 1 0,0

a) Day s6 nay c6 bao n hieu s6 h9ng?

b) So h�ng thu 30 cua day Ia so nao?

Bai 1 3 Cho day s6: o,1 ; o,o-1 ; o,oo 1 ; �

a) So h�ng thu 1 ooo c 6 bao nhiel.J chCrso o ph a n th�p phan?

b) Be viet tlt so h�ng thu nhat den so h(;lng thu 1 00 phai dung bao nhieu chu so 1 ;

bao nhieu chu so 0?

Bai 1 4 Cho day c6 quy lu�t sau: 1,21; 1 ,23; 1 ,25; 1 ,27; ; 2,31

a) Day tren c6 baa n hieu so th�p phan?

b) Tfnh tong cac so th�p ph an cua day tren

Bai 1 s nm x1 biE�t:

a) (x +O�S)+(x +0,25)+(x +0, 1 25) + (x + 0,0625) = 1

Rise above oneself

and grasp the world

Archimedes School

Aschoo Led u vn

· ARCH I M EDES SCHOOL

Bai 1 2 Cho day so; _1 , t ; 2, 2; 3r3; � · ; 1 qs,9; 1 1 0,0

a) Day s6 nay c6 bao n hieu s6 h9ng?

b) So h�ng thu 30 cua day Ia so nao?

Bai 1 3 Cho day s6: o,1 ; o,o-1 ; o,oo 1 ; �

a) So h�ng thu 1 ooo c 6 bao nhiel.J chCrso o ph a n th�p phan?

b) Be viet tlt so h�ng thu nhat den so h(;lng thu 1 00 phai dung bao nhieu chu so 1 ;

bao nhieu chu so 0?

Bai 1 4 Cho day c6 quy lu�t sau: 1,21; 1 ,23; 1 ,25; 1 ,27; ; 2,31

a) Day tren c6 baa n hieu so th�p phan?

b) Tfnh tong cac so th�p ph an cua day tren

Bai 1 s nm x1 biE�t:

a) (x +O�S)+(x +0,25)+(x +0, 1 25) + (x + 0,0625) = 1

Rise above oneself

and grasp the world

Archimedes School

Aschoo Led u vn

Doi : 32o/o = 0,32; 1 Oo/o = 0, 1

Neu coi khoi luqng cong vi?c.cu Ia i adn vi thl khoi 'h iqng c6ng vi�c m6'i so vdi

vi�c cG Ia: 1 + 0,32 = 1 ,3 2

Neu cof nang suat l a o dqng c G I a 1 ddn vj nang suat d()n g mcri so v6'i nang

i(t l =f " _ , , 1 (\ 1 1 1

SUa .ao uqng cu a: + V y = , I

f)e th{jc hi�n dvqc khoi l vqng c6ng vi$c moi voi nang suat lao d¢n g m�i t hl so cong

n han phai d9t toi muc la: 1 ,3 2 : 1 / 1 = 1 12

V�y ti so phan tram so c6ng n han phai ta ng them so voi so cu Ia: 1 ,2 - 1 = 012 = 20o/o

Bap so 2o%

B a i t�p

Bai 1 37 M(lt so sau khi g iam di 20o/o thl phai tang them bao n h ie u phan tram so moi

de l�i au'Q'c so cu? · ·

B a i 1 38 M<?t so tang them 259·6 th1 phai g iam di bao nhieu ph an tram so moi de l9i

B a i 1 39 Di�n tfch cua m<)t hl nh chu n h�t se thay doi the nao neu tang chit�u dai cua

n6 len 20% va giam chieu r<)ng cua n6 di 20%?

Rise above oneself

and grasp the world

Doi : 32o/o = 0,32; 1 Oo/o = 0, 1

Neu coi khoi luqng cong vi?c.cu Ia i adn vi thl khoi 'h iqng c6ng vi�c m6'i so vdi

vi�c cG Ia: 1 + 0,32 = 1 ,3 2

Neu cof nang suat l a o dqng c G I a 1 ddn vj nang suat d()n g mcri so v6'i nang

i(t l =f " _ , , 1 (\ 1 1 1

SUa .ao uqng cu a: + V y = , I

f)e th{jc hi�n dvqc khoi l vqng c6ng vi$c moi voi nang suat lao d¢n g m�i t hl so cong

n han phai d9t toi muc la: 1 ,3 2 : 1 / 1 = 1 12

V�y ti so phan tram so c6ng n han phai ta ng them so voi so cu Ia: 1 ,2 - 1 = 012 = 20o/o

Bap so 2o%

B a i t�p

Bai 1 37 M(lt so sau khi g iam di 20o/o thl phai tang them bao n h ie u phan tram so moi

de l�i au'Q'c so cu? · ·

B a i 1 38 M<?t so tang th m 259·6 th1 phai g iam di bao nhieu ph an tram so moi de l9i

B a i 1 39 Di�n tfch cua m<)t hl nh chu n h�t se thay doi the nao neu tang chit�u dai cua

n6 len 20% va giam chieu r<)ng cua n6 di 20%?

Rise above oneself

and grasp the world

ARCHIMEDES SCHOOL

b) 1, 2 + 1, 7 + 2, 2 + 2, 7 + + 1 24, 7 + 1 25, 2

c) 1 0, 1 + 1 1, 2 + 1 2, 3 + 1 3, 4 + +93,7 +94,8

Bai 1 7 Tong cua hai so la 1 2,4 Biet so thu nhat bang � 3 so thu haL llm hai s6 d6

B�ti 1 8 _M9t hlnh chG' rih�t co chit�u dai gap rllfli chieu r¢ng Biet c;hieu dai lon hdn

chieu r(>n g Ia 2,4cm Tfrih di�n tfch hlnh cha nh�t do

Rise above oneself

and grasp the world

Toan 5 - Quyen 2 1

H MQT s6 BAI TOAN KHAC

Chu y: Dol voi m.Qt so h3i toa n ve ti so phan tram co the h LJong dan hQc sinh alia

ve cac dc�mg toan quen thu9c nt;lti tong - ti, hi$u -ti, de· t1m ra_ dap so n ha n h han,

S6 thu nhat Ia: 0,25 : (1 + 4) = 0,05

so thu hai Ia: o,25 -o,os = 0,2

Bili giai:

}0,25

£>ap so: o,o5; o,2

Vi d� i: Gia g iay viet nam nay bang 1 20% gia· g iay n a m ngoaL Hoi val so tien mua

du<;1c 1 50 t� p giay & thai ctiem nam ngoai thl nam nay mua du'<;1c bao nhieu t�p giay?

Vi d�;� 3: Kh6i h.tqng cong vl�c tang 32°/o Hoi phai tang so nguoi lao d¢n g them bao

nhieu phan tram de nang SU!lt lao d(>ng tang 1 0%?

Bai giai ca�:::h 1 :

Neu coi khoi IVQ'ng cong vi$c cO Ia 1 00% t hl khoi luqng tof)g vi¢c mC1i so vC1i cong vi�c c:u Ia: 1 OOo/o + 32o/o = 1 32%

Neu coi na ng suat lao d(>ng cu Ia 1 00% th1 n a ng suat lao d(>ng m6t so voi nan g suat tao d<)ng cu Ia: 1 OOo/o + 10% = 1 1 Oo/o

f)e thtjc hi�n avqc khoi h.tqng cong vi�c moi voi nang suat lao a(>ng mdi thl so cong

n h a n phai d<;1t t6'i muc Ia: 1 32% : 1 1 Oo/o = 1 20o/o Vf?,y ti s6 phan tram so cong n han phai tang them so vai so cu Ia:

Archimedes Schooi Aschool edu.vn

ARCHIMEDES SCHOOL

b) 1, 2 + 1, 7 + 2, 2 + 2, 7 + + 1 24, 7 + 1 25, 2

c) 1 0, 1 + 1 1, 2 + 1 2, 3 + 1 3, 4 + +93,7 +94,8

Bai 1 7 Tong cua hai so la 1 2,4 Biet so thu nhat bang � 3 so thu haL llm hai s6 d6

B�ti 1 8 _M9t hlnh chG' rih�t co chit�u dai gap rllfli chieu r¢ng Biet c;hieu dai lon hdn

chieu r(>n g Ia 2,4cm Tfrih di�n tfch hlnh cha nh�t do

Rise above oneself

and grasp the world

Toan 5 - Quyen 2 1

H MQT s6 BAI TOAN KHAC

Chu y: Dol voi m.Qt so h3i toa n ve ti so phan tram co the h LJong dan hQc sinh alia

ve cac dc�mg toan quen thu9c nt;lti tong - ti, hi$u -ti, de· t1m ra_ dap so n ha n h han,

S6 thu nhat Ia: 0,25 : (1 + 4) = 0,05

so thu hai Ia: o,25 -o,os = 0,2

Bili giai:

}0,25

£>ap so: o,o5; o,2

Vi d� i: Gia g iay viet nam nay bang 1 20% gia· g iay n a m ngoaL Hoi val so tien mua

du<;1c 1 50 t� p giay & thai ctiem nam ngoai thl nam nay mua du'<;1c bao nhieu t�p giay?

Vi d�;� 3: Kh6i h.tqng cong vl�c tang 32°/o Hoi phai tang so nguoi lao d¢n g them bao

nhieu phan tram de nang SU!lt lao d(>ng tang 1 0%?

Bai giai ca�:::h 1 :

Neu coi khoi IVQ'ng cong vi$c cO Ia 1 00% t hl khoi luqng tof)g vi¢c mC1i so vC1i cong vi�c c:u Ia: 1 OOo/o + 32o/o = 1 32%

Neu coi na ng suat lao d(>ng cu Ia 1 00% th1 n a ng suat lao d(>ng m6t so voi nan g suat tao d<)ng cu Ia: 1 OOo/o + 10% = 1 1 Oo/o

f)e thtjc hi�n avqc khoi h.tqng cong vi�c moi voi nang suat lao a(>ng mdi thl so cong

n h a n phai d<;1t t6'i muc Ia: 1 32% : 1 1 Oo/o = 1 20o/o Vf?,y ti s6 phan tram so cong n han phai tang them so vai so cu Ia:

Archimedes Schooi Aschool edu.vn

9 1 3 3 So/o so

Bai 1 34 Dan so cua m()t qu�n nam 201 6 1a 560 000 ngu'oi, tan g 1 2% so voi nam 201 5

Neu tang 1 5% so Vdi nam 20 1 5 thl so dan cua qu�n a6 nam 20 1 6 1a bao nh ieu ngu'di?

Bai 1 35 M9t tinh c6 2 tri�u dan, trung blnh moi nam da n so cua tinh d6 l�i tang 5°!0

so voi nam tni6c Hoi hai nam sau, tinh d6 c6 bao n hieu ngucri?

Bai 1 36 Mqt nha may c6 2 000 cong nhan Cu sau moi nam, n ha may lgi tuyen them

1 0% so cong nhan so voi nam tru6'c Hoi sau ba n amr n ha may c6 tat ca bao n hieu

Bai 20 Tong cua hai so th�p ph an Ia 22,5 va hi�u cua chung Ia 1 ,22 Tim hai so

th�p phan d6

B ili 2 1 llm hai so c6 thllcmg Ia 2020 -va- hi¢u cua chung Ia 201 ,9

Bai 22 Ti m h a i so c6 tong va thudng cua chung aeu ban g 0,25

Archimedes Sch ool Aschool.ed u vn

9 1 3 3 So/o so

Bai 1 34 Dan so cua m()t qu�n nam 201 6 1a 560 000 ngu'oi, tan g 1 2% so voi nam 201 5

Neu tang 1 5% so Vdi nam 20 1 5 thl so dan cua qu�n a6 nam 20 1 6 1a bao nh ieu ngu'di?

Bai 1 35 M9t tinh c6 2 tri�u dan, trung blnh moi nam da n so cua tinh d6 l�i tang 5°!0

so voi nam tni6c Hoi hai nam sau, tinh d6 c6 bao n hieu ngucri?

Bai 1 36 Mqt nha may c6 2 000 cong nhan Cu sau moi nam, n ha may lgi tuyen them

1 0% so cong nhan so voi nam tru6'c Hoi sau ba n amr n ha may c6 tat ca bao n hieu

Bai 20 Tong cua hai so th�p ph an Ia 22,5 va hi�u cua chung Ia 1 ,22 Tim hai so

th�p phan d6

B ili 2 1 llm hai so c6 thllcmg Ia 2020 -va- hi¢u cua chung Ia 201 ,9

Bai 22 Ti m h a i so c6 tong va thudng cua chung aeu ban g 0,25

Archimedes Sch ool Aschool.ed u vn

Bili 26 Bao thu nhat n hieu hdn bao thu hai 25,4kg g9o Neu cho them vao moi bao

1 ,7kg t.h1 s6 g�o 0 bao thu n hat gap bq lan so g�o (j bao thu hai llm so g�o a moi

bao luc aau

Bai 27 Tfch cua hai so Ia 33,375 Neu tang thua s o tha nhat them 1 ,2 ddn vj thl ta

dlioc tfch m6'i Ia 40,875 Tim hai so ban dau: ·

Rise a bove oneself

and g rasp the world

Toan s -Quyen 2.1

G BAi TOAN LIEN QUAN £>EN DAN SO

1 Ly thuyet

56 dan nam· nay = so dan nam tnJoc a6 + % s6 dan nam tnJac d6

Vi d�: Cuoi nam 2000 nvacta c6 78· tri�u nguoi Hoi cuoi nam 2002 dan so nuoc ta Ia bao nhieu neu moi nam dan so tang 2%?

Bai 9iai

So dan nam nay = s6 dan ·nam tntac a6 + 2% so dan nam trvac d6

Cuoi nam 2001 so dan tang them Ia: 78'000 000 X 2 : 1 00 = 1 560 000 (nguoi)

· Cuoi nam 2001 nuocta c6 so dan Ia: 78 000 000 + 1 560 000 = 79 560 000 (ngVQ'i)

Cu6i nam 2002 so dan nv6"c ta Ia:

2 Bai t�p

79 560 ooo + (79 560 ooo x 2 : 1 OO) = 81 1 51 200 (nguoi)

f>ap so: 81 1 5 1 200 ngu'oL

Bai 1 3 1 f)au nam 201 8 dan so cua Vi�t Nam khoang 95 tri�u nglf<:ti Dau nam 201 9 dan so cua Vi�t Nam khoan g 96,9 tri�u ngubi

a) Hoi tu dau nam 201 8 den dau nam 201 9 dan so cua Vi�t Nam tang them bao nhieu phan tram?

b) Neu tu ctau nam 201 9 den dau nam 2020 dan so cua Vi-�t Nam cGng tan g vai ti l� tre n thl dau nam 2020 dan so cua Vi�t Nam Ia bao n hieu ngVai?

Bid 1 32 Dan so cua m{>t xa cuoi nam 201 8 Ia 1 0 000 nguai Biet rang ti I� tang dan s6trung binh moi nam cua xa d6 1a 3% Hoi cuoi nam 2019xa a6 c6 bao· nhieu ng u'Oi?

Archimedes School Asthool.�du.vn

Bili 26 Bao thu nhat n hieu hdn bao thu hai 25,4kg g9o Neu cho them vao moi bao

1 ,7kg t.h1 s6 g�o 0 bao thu n hat gap bq lan so g�o (j bao thu hai llm so g�o a moi

bao luc aau

Bai 27 Tfch cua hai so Ia 33,375 Neu tang thua s o tha nhat them 1 ,2 ddn vj thl ta

dlioc tfch m6'i Ia 40,875 Tim hai so ban dau: ·

Rise a bove oneself

and g rasp the world

Toan s -Quyen 2.1

G BAi TOAN LIEN QUAN £>EN DAN SO

1 Ly thuyet

56 dan nam· nay = so dan nam tnJoc a6 + % s6 dan nam tnJac d6

Vi d�: Cuoi nam 2000 nvacta c6 78· tri�u nguoi Hoi cuoi nam 2002 dan so nuoc ta Ia bao nhieu neu moi nam dan so tang 2%?

Bai 9iai

So dan nam nay = s6 dan ·nam tntac a6 + 2% so dan nam trvac d6

Cuoi nam 2001 so dan tang them Ia: 78'000 000 X 2 : 1 00 = 1 560 000 (nguoi)

· Cuoi nam 2001 nuocta c6 so dan Ia: 78 000 000 + 1 560 000 = 79 560 000 (ngVQ'i)

Cu6i nam 2002 so dan nv6"c ta Ia:

2 Bai t�p

79 560 ooo + (79 560 ooo x 2 : 1 OO) = 81 1 51 200 (nguoi)

f>ap so: 81 1 5 1 200 ngu'oL

Bai 1 3 1 f)au nam 201 8 dan so cua Vi�t Nam khoang 95 tri�u nglf<:ti Dau nam 201 9 dan so cua Vi�t Nam khoan g 96,9 tri�u ngubi

a) Hoi tu dau nam 201 8 den dau nam 201 9 dan so cua Vi�t Nam tang them bao nhieu phan tram?

b) Neu tu ctau nam 201 9 den dau nam 2020 dan so cua Vi-�t Nam cGng tan g vai ti l� tre n thl dau nam 2020 dan so cua Vi�t Nam Ia bao n hieu ngVai?

Bid 1 32 Dan so cua m{>t xa cuoi nam 201 8 Ia 1 0 000 nguai Biet rang ti I� tang dan s6trung binh moi nam cua xa d6 1a 3% Hoi cuoi nam 2019xa a6 c6 bao· nhieu ng u'Oi?

Archimedes School Asthool.�du.vn

65%

bay hai Ia bao n h ie u ki-lo-g a m trlnh phai say khong c 6 slj hao hl:Jt nao khac ngoai nlfoc)

Bid 1 30 Nguoi ta phoi 780kg th6c tuail sau kh i phoi thl kh6i higng th6c gia m 1 30kg

Tfnh ty so phan tram giua hiqng nu'oc va h Jqng thuan h�t c6 trong th6c da phai Biet

rang trong th6c tu'd'i n u'oc chiem 25o/o va trong qua trlnh phd'i khong c6 slf hao hl:lt

nao kha c ngoai n u'6'c

Rise above oneself

and g rasp the wo rl d

n h �t

B a i 29 M9t hlnh chu n h�t c6 ch u vi 26dm Biet rang, n eu tang chiE�u dai len gap 2,5

lan thi chu vi se hang 38dm Tfn h chieu dai va chieu n?ng hln h chu n h�t d6

Bai 30 M(>t a(>i cong n ha n da l a m xong q uang duong AB trong 3 tuan le Ju� n .1�

aa u n g u'oi ta lam au'Q'C 0,5 quang au'O'ng Tuan le th u hai lam duqc 018 quang dvang con l�i Tuan le th u ba lam duqc 3,5km n ua thl xong to�m b9 quan g aU'C1ng AB Hoi quang duong AB dai bao nhieu ki-16-met?

Archimedes Schoo l AschooLe d u vn

65%

bay hai Ia bao n h ie u ki-lo-g a m trlnh phai say khong c 6 slj hao hl:Jt nao khac ngoai nlfoc)

Bid 1 30 Nguoi ta phoi 780kg th6c tuail sau kh i phoi thl kh6i higng th6c gia m 1 30kg

Tfnh ty so phan tram giua hiqng nu'oc va h Jqng thuan h�t c6 trong th6c da phai Biet

rang trong th6c tu'd'i n u'oc chiem 25o/o va trong qua trlnh phd'i khong c6 slf hao hl:lt

nao kha c ngoai n u'6'c

Rise above oneself

and g rasp the wo rl d

n h �t

B a i 29 M9t hlnh chu n h�t c6 ch u vi 26dm Biet rang, n eu tang chiE�u dai len gap 2,5

lan thi chu vi se hang 38dm Tfn h chieu dai va chieu n?ng hln h chu n h�t d6

Bai 30 M(>t a(>i cong n ha n da l a m xong q uang duong AB trong 3 tuan le Ju� n .1�

aa u n g u'oi ta lam au'Q'C 0,5 quang au'O'ng Tuan le th u hai lam duqc 018 quang dvang con l�i Tuan le th u ba lam duqc 3,5km n ua thl xong to�m b9 quan g aU'C1ng AB Hoi quang duong AB dai bao nhieu ki-16-met?

Archimedes Schoo l AschooLe d u vn

ARCHIMEDES SCHOOL

Bai 3 1 Cho 56 20l 9 So nay se thay doi the nao neu:

a) VH�t them dau phay vao giU'a chii' so 1 va 9�

Bai 32 Cho m()t s6.th�p phan c6 hai ch u s6 a phan th�p phan So nay se tang giam

bao nhieu lan neu:

a) Bo dau phay di:

b) Chuy�n dau phay sang ben trai m¢t hang:

c) Ch uyen dau phay sang ben phai m¢t hang:

d) Chuyen dau phay sang ben phai hai hang:

Bid 33 Cho so 2 1,89 Hoi so nay se thay doi the nao r:eu:

a) Xoa bo 2 chO so cr ph an th�p phan:

b) Thay cac chu so 1 bang chu so 9 :

Bid 34

b) 2,0 1 9 bang bao nhieu lan 0,020 1 9? f)ap so:

c) 0,362 bang bao nhieu lan o,00362? Bap so: _ _

e) 0,1 045 bang bao nhh?u lan l 04,5? Dap so: _ _

16 1 Rise a bove oneself

and grasp the World

Toan s -Quyen 2 1

Bai 1 25� Lvc;tng ntt6'c trong hC;\t htoi chiem ty I� 48%, trong h�t kho chiem ti I� 1 0%._ Hoi phai 1 ,08 tan h9t tudi se duqc bao n hieu ki-lo-gam h9t kho?

Bai 1 26 H�t tvai co ti r� ntt6'c Ia 1-5%, h�t kho co ti 1� nuoc Ia 1 0°16 f)� c6 340kg h<;�t

kho thi can dem pho'i bao nhieu ki-lo-gam h�t tuui?

Bai 1 21 Nguoi ta phai sookg h�t tU'O'i, sau khi phai thl khoi l uqng giam di 60kg

Tinh ti so phan tram giua l u'Q'ng n uoc vii l lfqng thuan h�t co trong h9t aa phdi kh6

Biet ding trong h9t tllO'i luqng nuoc chiem ti l� Ia 20o/o?

Bai 1 28 Ti I� nude trong h9t ca phe tlfdi Ia 22o/o C6 1 ,4 tan h�t ca phe tu'd'i dem phdi kho Hoi lliqng nVdc can bay hai di Ia baa nhleu ae lu'qng ca phe kh6 thu .alfqc chi c6

ti l� nvoc Ia 4%?

Archimedes School 49 Aschool.edu.vn

ARCHIMEDES SCHOOL

Bai 3 1 Cho 56 20l 9 So nay se thay doi the nao neu:

a) VH�t them dau phay vao giU'a chii' so 1 va 9�

Bai 32 Cho m()t s6.th�p phan c6 hai ch u s6 a phan th�p phan So nay se tang giam

bao nhieu lan neu:

a) Bo dau phay di:

b) Chuy�n dau phay sang ben trai m¢t hang:

c) Ch uyen dau phay sang ben phai m¢t hang:

d) Chuyen dau phay sang ben phai hai hang:

Bid 33 Cho so 2 1,89 Hoi so nay se thay doi the nao r:eu:

a) Xoa bo 2 chO so cr ph an th�p phan:

b) Thay cac chu so 1 bang chu so 9 :

Bid 34

b) 2,0 1 9 bang bao nhieu lan 0,020 1 9? f)ap so:

c) 0,362 bang bao nhieu lan o,00362? Bap so: _ _

e) 0,1 045 bang bao nhh?u lan l 04,5? Dap so: _ _

16 1 Rise a bove oneself

and grasp the World

Toan s -Quyen 2 1

Bai 1 25� Lvc;tng ntt6'c trong hC;\t htoi chiem ty I� 48%, trong h�t kho chiem ti I� 1 0%._ Hoi phai 1 ,08 tan h9t tudi se duqc bao n hieu ki-lo-gam h9t kho?

Bai 1 26 H�t tvai co ti r� ntt6'c Ia 1-5%, h�t kho co ti 1� nuoc Ia 1 0°16 f)� c6 340kg h<;�t

kho thi can dem pho'i bao nhieu ki-lo-gam h�t tuui?

Bai 1 21 Nguoi ta phai sookg h�t tU'O'i, sau khi phai thl khoi l uqng giam di 60kg

Tinh ti so phan tram giua l u'Q'ng n uoc vii l lfqng thuan h�t co trong h9t aa phdi kh6

Biet ding trong h9t tllO'i luqng nuoc chiem ti l� Ia 20o/o?

Bai 1 28 Ti I� nude trong h9t ca phe tlfdi Ia 22o/o C6 1 ,4 tan h�t ca phe tu'd'i dem phdi kho Hoi lliqng nVdc can bay hai di Ia baa nhleu ae lu'qng ca phe kh6 thu .alfqc chi c6

ti l� nvoc Ia 4%?

Archimedes School 49 Aschool.edu.vn

Ta c6 sO' ao:

(= N uoc A - nvoc bay hoi) Chu y: Lu't;tng thuan hqt trong hgt tUai va hQt kho la bang nhau 0 dgng bai nay luon can

tim au'qcsolu'qng thuan hqt tn.tac (Thuan h9t Ia phon hg.t khong chua nuac)

Vi d�: Phai 3,6 t� th6c tu'oi thl avqc bao n h ieu t� th6c kho? Biet l uqng n uoc trong

th6c tuoi Ia 30o/o va trong th6c kho Ia 1 0%

sai giai Bai 3,6 t� = 36ok9

LVqng h�t thuan I a : 360 x ( 1 o o -30) : 1 oo = 252 (kg)

Trang th6c tho th1 h.tqng h9t thw3n chi em so ph an tram Ia: 1 00°/o - 1 0°/o = 90%

LVQ'ng th6c kho thu duqc Ia: 252 : 90 x 1 oo = 280 (kg) = 2,8 t9

£>a p sO: 2,8 t?

Bili 1 23 Luqng nttoc chua· trong h9t tuai Ia 55°/o C6 300kg h 9t tttai sau khi phai kh6

n h � di SO kg Tfnh ti so phan tram nttoc trong h�t da phoi kh6 ·

Bid 1 24 LVQ'ng n uac trong co tuai Ia 55%, trong co kh6 I a 1 0°/o Hoi phdi 1 50kg co

tutti ta auqc bao nhieu ki-lo-ga m co kho?

Rise a bove oneself

and g rasp the world

dau phay cua

1 8, 1 7 1 don vi Tim sa th� p p ha n d6 so

Bai 36 Khi d �ch ch uyen dau phay cua so th�p phtm SQng phai m<)t hang thl so a6

tang them 469,683 ao'n vj Ti m so th�p phan d6

Bid 37 Khi dich chuyen dau phay cua so th� p phan sa n g trai hai hang thl so d6 giam di 2 1 0, 1 77 adn vi llm so th�p p h a n do

Bai 38 Tim hai so th�p phan c6 h i�u Ia 1 1 5,7 Neu dai dau phay cua so be s ang phai m9t hang, roi c9ng -voi so lon ta dugc 1 66,3

Bai 39 Tong cua hai so th�p phan bang 1 1 6,554 Neu djch dau phay cua so thu nhat sang ben trai hai chO' so ta se avqc so thu haL Tt m hai so d6

Archimedes Sch ool

Aschool edu vn

Ta c6 sO' ao:

(= N uoc A - nvoc bay hoi) Chu y: Lu't;tng thuan hqt trong hgt tUai va hQt kho la bang nhau 0 dgng bai nay luon can

tim au'qcsolu'qng thuan hqt tn.tac (Thuan h9t Ia phon hg.t khong chua nuac)

Vi d�: Phai 3,6 t� th6c tu'oi thl avqc bao n h ieu t� th6c kho? Biet l uqng n uoc trong

th6c tuoi Ia 30o/o va trong th6c kho Ia 1 0%

sai giai Bai 3,6 t� = 36ok9

LVqng h�t thuan I a : 360 x ( 1 o o -30) : 1 oo = 252 (kg)

Trang th6c tho th1 h.tqng h9t thw3n chi em so ph an tram Ia: 1 00°/o - 1 0°/o = 90%

LVQ'ng th6c kho thu duqc Ia: 252 : 90 x 1 oo = 280 (kg) = 2,8 t9

£>a p sO: 2,8 t?

Bili 1 23 Luqng nttoc chua· trong h9t tuai Ia 55°/o C6 300kg h 9t tttai sau khi phai kh6

n h � di SO kg Tfnh ti so phan tram nttoc trong h�t da phoi kh6 ·

Bid 1 24 LVQ'ng n uac trong co tuai Ia 55%, trong co kh6 I a 1 0°/o Hoi phdi 1 50kg co

tutti ta auqc bao nhieu ki-lo-ga m co kho?

Rise a bove oneself

and g rasp the world

dau phay cua

1 8, 1 7 1 don vi Tim sa th� p p ha n d6 so

Bai 36 Khi d �ch ch uyen dau phay cua so th�p phtm SQng phai m<)t hang thl so a6

tang them 469,683 ao'n vj Ti m so th�p phan d6

Bid 37 Khi dich chuyen dau phay cua so th� p phan sa n g trai hai hang thl so d6 giam di 2 1 0, 1 77 adn vi llm so th�p p h a n do

Bai 38 Tim hai so th�p phan c6 h i�u Ia 1 1 5,7 Neu dai dau phay cua so be s ang phai m9t hang, roi c9ng -voi so lon ta dugc 1 66,3

Bai 39 Tong cua hai so th�p phan bang 1 1 6,554 Neu djch dau phay cua so thu nhat sang ben trai hai chO' so ta se avqc so thu haL Tt m hai so d6

Archimedes Sch ool

Aschool edu vn