Đề khảo sát chất lượng học sinh giỏi năm học 2012 - 2013 môn toán lớp 8

Đề khảo sát chất lượng học sinh giỏi năm học 2012 - 2013 môn toán lớp 8

I } [ [ O N G G I A O I ) T ] C ]

I ' I I A N I I P I I O

V A D A O

V I N I I

r4C) f } E K [ [ A { } SA'I- CTTAT'E-I-1"#N{J F E O C S [ ] * * ' F { { ; H { } E

N A V I I I O C 2tkt2 - 2CI13 l\46m thfr: Tqlrlar lo'p I ' i - l r o i

g i a r r la i l t r a i : l 2 { } p f u u t

C T I I N Ht'r r ir'c

r ) : : r

D t i l [

.)

c a "

(4 die i ti'y

C l r o x : 6 y + c z ;

Chirng minh:

y : c z * a x ; z - a x *

+ _ + _ _ /

1 + a 1 + b 7 + c

L

Zalx*al *r

- _ _ L | | ,\

Bii 2: (5 diAm)

a Voi a, b la cac s6 nguy6n Chung rr-rinh

c h o 5 t h i a o - b o c h i a h6t cho 5

b Tini s6 du' trong phep chia cua bieu thuc

d a t h u c * ' + 8 x + 1 2

b y v a x * y ' + r , , + 0

(a la hang so)

r d n g n 6 u 4 a ' + 3 a b - 1 1 b 2 c h i a het

( x + 1 ) ( x + 3 X r - 5 ) ( x + 7 ) + 2 0 1 3 c h o

Bii 3: Q di)m)

Cho * I 0, y > 0 thoa mdn r' + y' : x - y Tim gia tri lon

t h u c A - x 2 + y 2

Bii 4: -(6 diAm)

-.,,^r

Cho AABC c6n tai A ( A < 600 ) Tr€n rnot

vE tia Ax sao cho CA - iaB Goi E ld di6m d6i

tai D C6cducrng thSng CD vd CE cit AB lan luqt

a Chung rninh ACDE ld hinh thoi

b Chuns minh: AI(.BA - BK.AI

c Ggi d ld dudng thing di qua A kh6ng c6t c4nh BC X6c dinh vitri di6m M tr€n dudng thing d sao cho chu vi AMBC nh6 nhdt.

Bii 5: (2 di€m)

Cho irinh vu6ng

vu6ng goc voi AM tai

nhAt

\

ABCD co canh bdng 1 M

M cft canh CD tai N Tirn

n h A t c u a c u a b i e u

nria mat phing b0 AC chu'a di€m B

xung vcyi C qua Ax N6i BE c6t A* tai I vd K

diem ndm tr6n doan BC Duong tri cliem M Ae CX co do dai lo'n

1d

v i

FIet

PHONG GIAO DUC VA DAO TAO VINH

Thd'i eian lirm biri: 120 phtit (khone ke phat dC) CAU | (8 di1m):

"ll,ri rho Que haong cua T6 Hanh cho th6y tinh carn qu€ huong tlong sang ilia thielt e Lia nhir tho", hdy ldrn s6ng to

n ^ ^ ' , n : ' :

Citu2 (10 di€m)

l)ui r,at, doan vdn Trong ldng me,trich n6i ty':'NnU'ng ngay tho Au" cua

, '

\rruren llirng lanr 16 tinh y€u thuongch6y bong cria nhir vbn thoi thcr Au doi voi nguoi rne bAt hanh

H€t

on xHAo sAr cnAr LTIqNG Hec srNH Gror

Bt rnr cniivn rHrlc Mdn thi: H6a hgc l6p 8

Thdi gian ldm bdi: 120 phfit

Ciu 1: (3 diCm) Cdn bdng c6c ph6n img h6a hoc sau:

a) Alz(SO+): + KOH

c) CnHzn-z + Oz

e ) M + H C I

Cdu 2: (a di6m) oOt ch6y ph6t pho trong kh6ng khi thu dugc ch6t rln A, hda tan A vdo nu6c du thu dugc dung dfch B Cho kim lopi natri du vdo dung dfch B thu duoc dung dich c vd khi D DAn khf D di qua h5n hgp bQt E g6m Al2o3, Fe3oa, cuo nung n6ng thu

dugc h6n hqp kim loai F ViCt c6c phucrng trinh h6a hgc xity ravi cho bi6t A, B, C, D, F

ld nhfrng chdt gi?

Cffu 3: (a di6m) Cho cdc kim lopi: K, Al, Fe vd dung dich HCI:

r t i r A

a NOu lAy cung m6t kh6i lugng kim lopi trdn cho t5c dqng htit vdi dung dich HCI thi kim lopi ndo cho nhi6u khf hiclro ntrdtZ

b N6u thu dugc cirng mQt thd tfch khi hidro thi kh6i lugng kim loai ndo dtng itnhSt? Cffu 4: (5 diCm) Cho 1 V,g2lithSn hqp khf X gdm hidro vd butan (CaH16) o diAu kiOn ti6u

, : , " , , i ,

chudn co t1i kh6i so v6i oxi le 0,5 DOt h6n hqp X voi 64 gam khi oxi Sau khi phAn fmg xtry rahohn toin thu dugc hdn hqp khf Y

- , ^

a Viet phucrng trinh hoa hgc xhy ra

b Tinh thdnh phAn phAn trdm th6 tich m6i t<tri trong hdn hcr,p Y

Cdu 5: (a di6m) H5n hqp khi A g6tn u mol SOz vd 5a mol kh6ng khf Nung n6ng h6n hqp A v6i V2O5 xirc t6c thu dugc h5n hqp khf B Bi6t rdng ti kh6i hoi cria A so vdi B bing 0,93 Hdy tinh hi6u su6t phin img tr6n v6i gi6 thit5t kh6ng khi c6 chira 80% th€ tich

ld N2 vit20%o th6 tfch ia Or

PHONG GIAO DUC VA EAO

TAO THANH PHO VINH

Hiit

P l l o \ ( ; ( ; 1 ' \ o l ) t l c V A D A o

I \ 0 I ' I I \\ I I P I I O V I N I I

D E K I I A O S A T C I I A T L I ' ( ) \ ( ; I I O ( ' S I N I I ( ; I O I

N A \ { II o c 2 o l 2 - 2 o r 3

r ) r 'r t r r c r r i x u r t r u ' < t M 6 n t h i : L i c h s r i ' l 6 p 8

Thd'i giar-r lir.n btti: 120 1thfit

( r r , I 1 \ r , , l r L , t t i ) : ( ' r c r r r r t r c t r L L r a l A n h , P i - r / r 1 t D u : , M i c L r o i t h c l i \ l X d a L r t h i h i \ X :

r l ) r t l i j i n c h L r p g , n 0 i b a t t r o n g s t r p h a t tr i 6 n k i n h t 0 c i l a c l i c n L L o c ?

ir il:rr piu clilc- cli0rrr r.i0ng ci,a iung iru',r'c va giai thich r,i slto co ciiic cli0nr citi'l

( ' i r t i I r l , ( t 1 1 1 1 ; ' 1 7 1 : I ' h 0 r- r a o l i P l - r o n g t r a o C a r r V u o n g ' ? l - r r r - r l i b l i l ' c r c : g i l i c l o a r r p h r i l tr i e ' r l

c i r a P l t o t - t g t r a o C A n V u o r r g ? ( l : i u J 1 , : ' ' , t ) t l i t ; ' t n 1 : i ' r i o l i - r ' r , r c a i c 6 c h o V i 0 t N a r n n i r a c u 6 i t l i O k i X I " \ :

rr (.'ric Llssp lai sl plrg 1,8u nu'cic dur ra nhfr'ng cle rtglii clii c:fch trotlg

i i c l r s u t t L t t i c L a rr h r - t t h 6 n a o ?

i, 1.,0 tcn cic niri\ cLii cich va n€r-r noi dung chinh, f nghia cLra cac ciO

c r c l t '

bcii ciinh

n g h i c a i

Ht!t

p u o \ ( ; ( ; t i o DUc vA DAo TAo' r ' r r A N r r

p i r o vrNrr sAr cnAr LU'oNCl xAru Hec zo12 - 2ot3 rroc srNr{ c;lol

DE KfIAO

D I i - f I I I C I I i I t I T T T I T T C M d n t h i : S i n h h g Iir.p 8

Tlrdi gian larn bni: t 20 phfit

Cii u I (3 ctiern )

I-lny nOu cac tl-ranl-r phAn cAu tao r0 bao

thong nhit vd chu'c ndng gifra mang sinl-r

? .Qu" do giAi tirich moi qLran hg chdt, chAt t0 bao var nhan?

ti6t trong sLr trao cloi chat

C i u 2 ( 3 d i e m )

N€, vai tro cria h0 ti€u h6a, hg ho hep va h6 bai

giira co thO voi rndi tn-rcrng ?

C i u 3 ( 3 5 d i e r n )

I 'frong rr-r6t non su bi6n d6i thric dn di6n

2 Su kh6c nhau co bin cua qu6 trinh tiOu

rni6ng la gi'?

ra theo nhimg hinh thuc nao?

hoa cy rudt non, da day va khoang

(li u -l (-l cli0rn)

t

ff ,i thf nghi:- 9hu'ng minh : I'rong thanh phAn hoa hoc cua xuong co cei chiit hiru co va chAt v6 co?

2 Tai sao ngucri gia gion va dE gd)''l

C i u 5 ( - l 5 d i c r n )

Clo 4 ngucri An, Binh, Cuong, Pung thr-roc cdc nhom prau khac nheiu t.i-1, tltatt cr-ra An hodc Cucrng chuy6n cho Binh thi khong xAy ra tai bien Li; rtrau c-ua Cluong chuy6n cho An hodc lAy m6u cua Dfrng r'nuyOn cho Cu'o',-rg thi xaiy ra tai bi0n

'['inr

nhirrn rni u cua m6i nguoi

C i u 6 ( i d i 0 r l )

I Srin phirn ti€t cira

l S o s i n h t u y 0 n n o i

l a g i ? N e u

i ^

go?l tr0t'/

tr-ryOn

t l e t v a

noi ti€t

iLlyen n

vai tro cua no '/

J JEt

t ' i i ( )\ ( ; ( ; t ) & t) ' t t t ' \ ' t N I i I f l I A o S A ' r c l l r i T ' I, U ' O N ( ; I l 0 c s l \ t l ( ; l o l

N A N { I I O C 2 0 1 2 - 2 { } 1 3

N ' l 6 n t h i : ' f I E N ( i A N I I L O P 8 l'hi'i ,gitut' 120 plu.?t (khirts ki tlro'i gitrtt.gl,to tlit

i I o r r r ti ' n ! h i s i r r l r :

\ i r - l : r t t l t l ' u t g l t i i n t s i n h :

I I o e t i r r l t t r r r i v r r g :

i s i r Ir A o I) A N I i

i

I I

I

I

t -I

I S ( ) I ) l l A t ' l I

-I

I I

I I

I I

1

i

( I II I ) , A N :

I I)i tlri erl 0-1 trans l-hi sinh l<iern s0 trang tnt6'c l<hi ll\rn bai

I I h o ' i g i a n lr ) r n b i ) i 1 2 0 p h u t

.l lhi sinh laur bai truc ti0p vao de thi I)oc kiyOu cliu trr-ro'c l<hi liirl ba\i (lhi cir-r trui liri vlro llhrln Yortr Answ,ers vd chtl tr6ng cho s[n (trong phan Writing) -t 'l'hi sinir r i0t bang but mOt mau (xanh ho[c deu) Khong dtng birt nra\u clr\

i \ctr thi sinh larn sai, dung thuoc g4ch l<hong cling birt tiv tring

( r I i r i s i n h u i 0 ' g i n ci n t h a n b a i la r n

1 irlrirng t l r r n g L r i t c i r t i t i li 0 t r t t a o k 0 c a ti r d i O n

I ( l i i r n thi coi thi l<hong g i a i th i o h g i t h e m

Bii thi rrrdn: TIENG ANH LOI'} 8 Thdi gian lam bdi I20 phrir

Hg t6n, chfr'ky gi:U! li!i!q r,:s6p h a c h

l l i r r r

1 1 1 , , , ,

I ) t l i l l

-s i r :

chir'.

StrCTION A : PHONtrTICS

(ltrcstiorr tr (5 ;roilts) Pick out the u,ord n'hose underlincd purt is pronorutc'crl dilferentl-l' _fi'orrr thc others.

i A s r c a t

L A l t o r v

3 A o p e r t c c l

-+ A happy

5 A l a u s l i

[3 brgad

lJ torvn

B caused I) busy

B ploug[

Cl break

C polver

C increased

C dry

C coug[

I) narne

D slorv

D c l o s e d

D nois),

D enough

Y o t r r A r t s u , e l ' s :

Qucstion 2 (5 points) Iclentify the word wlrose stressetl patlern is dffirent.from that oJ lltc others

.1 A parlicipatc B helicopter C citizenship D rnagically

_l

SECTION B _ READING Qucstion 1 ( 1 0 points) Complete this conversstiott using sentences markerl by A-F There

is one e-ttro senlence which you do not need to use Vl/rite lhe lelters in 'Your Anstvers'

DU|1.

( ).llic iul

rt /i'.s ,Jones ;

t )1.lic'iul

,\'/t".s ,Jones.'

r ){iic'ial

,'11'.r .Jonas;

()/lit'iu|:

G o o d ( i )

W e l l ,

lnorning madatn.

I rvill try What is the problem?

( , 2 )

I sce Well we lnust get it down

( 3 )

By sending one of our cat expcrts arottnd

to your house

, 1 / i ' i I o t t e s : ( 1 )

()llic'iu{.' Oh' I think so It's not a very unllsual

problem

, l / i ' i l ( ) t t e s ; ( 5 )

Y o u r A n s r v e r s :

- - - t

A How r.vill )iou do that?

B G o o d m o r n i n s , s i r

C It's lrly cat, Jennit-er She \vent Llp a tree, and she's stucl<.

D I{ello, I \r,onder i{'vou cor-rld help rne

E, Well, it's the first tinre it has happened to mc!

F W i l l h c b c a b l c t o l i c l n ' /

_t

I'hitns GD&D7'thdnlt pho [/inh - KSCL HSG l6p B ndnt hpc 20]2-2013 Irage 1 ol-4

Qrrcstion 2 (I0 points) Reod thepassage andcirclethe best option to cotnplele eoclr

.;a tt lt nct ltt'lott.

ASPIRIN l1'),ou think that aspirin is good fbr only headache think it again A rccL:nt sttrd) ltrr rliscovcrccl that aspirin can also reducc the risk ofhean attacl( colotl canocr, stltne kintls ,rl slr.okcs and high blood pressure in pregnant wollen Should ever,r'one takc aspirin'? ,\spirin is salt lilr those rvho suffer from a headache or other mild aches and pains I1'your ililcss is more scrious, you should ask your doctor If you takc aspirin fcrr a long titttc rtttt

u ill have stomach pains and hearing problems Even though doctors believe thal aspit'itr cnrl cure illlesses such as heart disease, they will encourage people to eat a hr:althl' dicl do crcr.cisc and not to smoke Aspirin cannol take the place o1-these good healthv dicts doing cxcrcise and not srnoking

l A : P i r i n

A Can be used til

Il Can be usecl to

C Can bc used to

[) Can be used to

c r a n L r c r s t r o k e s a n d h i g h

treat only headache treat only headache and stomachache treat only headache and heart attacl<

treat only headache, to reduce the risk of heart attttcl<, ctllot-t blood pressure

'')

-).

l A s n i r i n c a n b e u s e d

A as nruch as you u,ould like because it has no bad effects

Ll to crlre illnesses such as hearl disease

C as much as you rvould like when your ilh-ress is serious

I) rvithout prescription only when,vou suffer rnild aches and pains

[1'\'or-r take aspirin for a long titne,

A vou rvill have stomach pains and hearing problerns

B ),,r,-, u,ill be all right

Cl ),tttt u,ill be prevented from heart attack

D you have no problem

.1 Although doctors knorv the usefulness of aspirin, they still aclvisc the patients

A to take aspirin as tnuch as possible

Il to'do exercise, to have a healthy diet and not to suroke,

Cl to do erercise is not necessary

D to take aspirin and smoke

5 A s p i r i n

A

u

C

D

Y o u r A n r

can be used for every illness

has no undesired eff-ects

cannot take the place of doing exercise, having a healthl' diet aud uot snrol<ing can take the place of doing exercise, having a healthy diet and not stnol<ing Ansrvers:

SECTIOI.I

Q u e s t i o n I ( 1 0 p o i n t s ) C h o o s e

.fbllox'irtg senlences lltrite it irr

I It's vcr)' cold in here Do you

A c l o s i n q B t o

2 l\'11' ll'icncls n,ill

A t-lrt

l Wc \\'crc nraclc

A t o d o

v i s i t m e

C - VOCABULARY & GRAMMAI{

the best ansv,erfrom A, IJ, C or D to cotnltlele euch r{'tlte 'Your Attsvters' port

B a t all the

B d o

Christmas Da1'

C rvhile cleaning in the liouse

C cloing

D c l o s c d

D i n

D c l o n c l'lritrrg GD&DT thanh pho l/inh - KSCL HSG /d'p B niint hrzc 2012-2013 Page 2 ot- 4

Y o u r " A n s r v e r s :

i l

f.l'

-+ _ - r'r'cittlier'! We can't go out fbr a walk now.

A Ilorv terrible Il How a terrible C What a terrible I) What tcrr"iblc

5 I'.rrch ol'you a share irr the work

ir l-hcrc is = * {ood left, but not enough for everyone.

7 I arn usecl to try bus and never get siok

8 I bought sorne newspapers have something to read on the trip

t) Petcr: 'Make yoursell-at home!' - Mary: '_-_ '

A Not at all Don't rnention it B Thanks Sarne tcl 1,'tltt

Cl.'I'hat's very nice Thank you D Yes Can I |ave ),tlLt'/

10" 'l'he nlan a large hat over there can speak English well

Question 2 (10 points) .In euclt of the lines (from I to I0) in the fbllowitlg puro{:ruph, there is OIYE unnecessary word Find and write it irt 'Your Answer' pnrl

I nrentioned it to my parents They were been quite surprised I didn't think 2 but they u,cluld object because they both had dogs when they were young 3 -l'hcy

irnrnediately began to telling me of a1l the responsibiiities I would 4 have them My father stressed the fact that dogs require a lot of attentior"r 'l'hey i have to be fed, taken fbr a long walks everyday and regular visits to the vet My 6 rnothcr she told me that all these things cost quite a bit of money and apart fi orn 7 that clogs need love and affection She asked rvith me whether I rryas prepared to B c1o ail thcsc things After our talk, I realized that I hadn't thought as scriously 9 cnough about it the situation and that I would have to rethink the idea I 0 Your Ansrvers:

l l

I I

Qucstion 3 (10 points) Complete the parogroplr below, usirtg the correct form oJ'the n,ords in bruckets,

HEALTHY E,ATING Irr the past, any mother would be proud if her children were rouncl and slightll' fat 'l'hosc

too much fat and sugar in children's diets are a major factor in the (3 DllVEl,Ol') ol'hearf diseases and other (4 ILL) rvhen they are older I{owever, (5 ( i l i ( ) \ I i ) children need to ea| a rvide ranqe of foods and their seneral hcalth could bc (6 DANGtrR) by cutting out particular ones Psl,chologists say that thc

so that children do not lose muscle in addition to 1at Parents shoLrld prescnt loocl a little (9 DIFFERL,NCE) , spread butter thinly and avoid putting sllp.al' on thc table Children should aiso be (10 COTJRAGE)

thet' ri,ill lrc using the calories that they have eaten

to take part in sports this tt/a)'

Phing GD&DT'thdnh phi Vinh - KSCL HSG lop B ndnt hoc 2012-2013 Page 3 of t

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S E C T I O N I) _ W R I T I N G ()rrt'stion I ll0 poirlts) {-tttrtltlete tlte secon(l sentertce so lltut it ltus tr sirrrilur In((utirtg ltt tltt'Jirsl onc ,9turt witlt the x,orrls givert.

I S i r c c i u r t l c a r n lr n s l i s h u ' c l l b e c a t r s e s l t c is t o o o l d

) S l t c i s t o t r

l \\/c stlirtcd st'on'ing rubber tl'ees liere 20 vcars ago.

) \\,'c har c

l I l o \ \ ' ( i l t l d ( ) \ ' ( ) u lh i n k t h i s b t r i l c l i n s i s ' /

) \ \ i l r c r ]

- i l h c t r i p c l i c l n ' t co s t a s m u c h e t s I t h c l u g h l

9 l ' h c t r i p n a s

5 'l hcv ltal'cr.r'l sccrt their uncle lbr tcn )iears

) i t ' s

u lto ul

(Jrrcstion 2 (10 points) Imogirte.y,ou ore on holiduv in l/inlt citlt IYritc u lsoslt'urd (t1f

120 v'ortls) to-t,our Englishfriend, X4ury, ultorttJ)our holida-l' (lse Lurr us t'ortt'n(rnt(

l)cur ,\/ut'l

L r t t t

_ T h e c n c l

i , t ; , l r ;i )(( D'l'thdtth phi l"inlt - KSCL H,SG lolt B ncim ltoc'2()12-2013 Pzigc zl of 4