Vay chqn dap an D.. Vay chon dap an C.. Vay chgn dap an C.
Trang 1Giai
Ng Lf cf
i ca
n th i
c6
d ie m
C LT C
c an e ac
h ma t
10
c
m, di em c ii
c
vi
ln
e
ac
h
ma
t 50 cm , de
o ki nh
c6 d
o tu
-2 di op s at m at t hi c6 th
e nh in
ro
va
t of
xa v 6
C LT C
m
a ma
t kh on
g ca
n di eu t ie
t
Vay chqn dap an
D
Cdu 48:
V
at san
g A
B c
6 dan
g mo
t doa
n thSng , da
t vuon
g go
c vd
i tru
e
chinh
(A
n km tren true chinh ) cu
a mo
t tha
u k in
h, ta
o r
a an
h A
iB
i =
4em
ro ne
t tr en m an Giu
f va
t v
a ma
n c
o dinh , d
i chuye
n tha
u
kin
h do
c
theo tru
e chin
h de
n mo
t
vi tr
i kha
c t
hi la
i th u
diTOc
anh
A2B2
= 6,25c
m
r5 ne
t tr en m an D
o ca
o va
t A
B bkng
:
A.
1,56 cm
B
25 cm C 5
cm D 5,1
2 cm
Giai
Ta c
6 2 v
i tr i:
_ d
A 'B '
4
-V it nl :—
= =
A
B
AB
_V it ri 2:
l = ^ = ^
Giai h
e go
m ha
i phifcfn
g tr in
h (1 ) v
a (2 ) t
a duac
A
B =
5
Vay chon dap an
C
Cdu 49:
M
ot tha'
u k in
h mon
g ban
g thu
y tin
h ha
i ma
t ca
u loi , c
6 chie
t
suat tuye
t do
i n Tha
u kin
h na
y c
6 d
o tu :
A
am k
hi da
t tron
g mo
i triicfn
g c
6 chie
t sua
t tuye
t do
i n ' <
n
B difcfn
g kh
i da
t tron
g mo
i trUofn
g c
6 chie
t sua
t tuye
t do
i n
' =
n
C am k
hi da
t tron
g mo
i tri/ofn
g c
6 chie
t sua'
t tuye
t do
i n ' >
n
D luo
n dUtfng , k
ho ng phu thuoc va
o mo
i tn/cfn
g chuf
a tha
u k
in
h
G\k\
Mo
t tha
u k in
h mon
g hkng
thuy tin
h ha
i ma
t ca
u lo
i, c
6 chie
t sua
t
tuyet do
i n Tha
u kin
h na
y c
6 d
o t
u a
m kli
i da
t tron
g mo
i trUcfn
g c
6
chiet sua
t tuye
t do
i n ' >
n
Vay chgn dap an
C
Cdu 50:
M
ot ki nh t hie
n va
n quan
g ho
c go
m va
t k in
h v
a th
i k in
h l
a cAc
thau k in
h h
pi tu c6 tie
u CL
T
Ian
li
/crt l
a 1,
2 m
va 6
cm
Mo
t ngifcf
i m^
t
khong
C O
t at , qua
n sd
t mp
t t hie
n th
e
o f r
at x
a hkng
k in
h t hie
n va
n na
y
trong tr an
g t ha
i m^
t kh on
g die
u tie
t c
6 go
c tr on
g an
h l
a 5' Go
c tron
g
th ie
n th
e kh
i k ho ng dung k in
h l
a:
A 0,5"
B 0,25'
C 0,35'
, D 0,2'
22 •
GAi Ch
i ti^
t 66
thi T
S BH ,
C
M6n V^
t l
(