CHO M PHUONG TRINH
2. Cho
M
phuong trinh:
{3X-2Y=7.
x+2y=-3
qp
s3 nao sau day la nghi~m cua h~ tren: (0;2,5), (1;-2), (-1;-1), (3;1)?
Cau 2. (1,50
iJiim)
Khong dung may tinh dm tay, hay ghii cac phuong trinh, h~ phuong
trinh sau:
a)
2x
2
+3x-5=0;
b)
{X-2Y;"5.
3x+ y=!
Cau 3. (2,00
iJiim)
Cho ham s3
y
=
f(x)
=
2x2.
a) Tinh cac gia
trif(-I),j(2),fG)'
b)
Ve
d6 thi ham s3 da cho tren
M
tf\lC tQa dQ
Oxy.
c) Nhin vao d6 thi, hay chi ro ham s3 d6ng bi~n khi
x
duong hay lim? Ham s3
nghich bi~n khi nao?
Cau 4. (1,50
iJiim)
Giai hai tooo bAng cach I~p h~ phuong trinh
Hi~n 4\i cha hon con 28 tu6i. Tu6i cua cha cach day 10 nam gAp doi tu6i cua con
bay gUY.Hoi hi~n t\1icha bao nhieu tu6i, con bao nhieu tu6i?
Cau 5. (3,00
iJiil'fl)
Cho hinh chfr nh~t
ABCD,
v6i
AB
=
1,
BD
=
2. GQi
E
la di~m thuQC
c\llili
CD.
Qua
D
ke duang thAng vuong g6c v6i
BE
c~t
BE
a
H
va c~t duang thAng
BC
4\i
K.
a) ChUng minh rAng
BCHD
la tlr giac nQi ti~p.
b) Tinh s3 do g6c
CHK.
c) ChUng minh rAng
BE.EH=CE.ED.
d) Khi
E
ch\1ytren c\llili
CD
thi dit~mH
ch\1ytren duang nao?
--- --- nET---
Thi sinh khong illrvc
su
dyng tili li~u. Giam thi khong gilli thich gi them.
HQva ten !hi sinh:
;S3 bao danh:
.
-.:;;--~---
..:..;:::;,~,._-~-==-
,--=
sa
GIA.O DVC vA. DA.O T~O
DE KIEM TRA HQC Ki II, NAM HQC 2012-2013
TiNHPHUYEN
Mon: TOA.N; 16'p 9
/DE
CHINH THU'cl
TMi gian lam hili:
90
pMt, khOng ki tMi gian phdt
iJJ
HUONGDANCHAM
(G6m co 03 trang)