UBND rNH rHAt NGUYEN rir rnr cHeN Hec srNr{ cr6l cAp rinrg r,6p ro
so Gr{_pUC & pAo rAo -i- NAn"{ Hec zg1s _zo-G
rhdi sian:
*f{{*$tr:;r'i'rff;f*n siao di)
Bni 1 6 aie4
a) Gi6i phuong trinh: z(s*' + z) + 3(*, - zx)Jx -t - 2(*, + 7 x).(1) .
f *'*4y-y3 +l6x
b) Giei he phucmg trinh: I -.
L,*r'-s(l **')
BAi 2 g aieml
Hdy tim tdt cec6c nghidm nguy6n ducnrg (*;y) cria phucmg trinh:
1111l-r
;-r- 3*i'
Bni 3 1+ arcm1
Trong m{t pherrg tga dQ Oxy, cho hinh binh henh ABCD c6 A(-5;2).
;.'
, u1-t;-21 ld di6m nim b6n trong hinh binh hanh sao cho ffie =ffie vit
i
MB L MC .Tlmtga dQ di6m D bi€t tunffi =1.
z
Biri 4 6 aia4
TrCn bTg den ta vi}t zOrc d6u cQng (+) ve Zafi a6u (-) Cho ph6p
x6a hai d6u tuy y vd vi6t thay vdo d6 mQt d6u cQng ni5u hai ddu d5 x6a li nhu
nhau, vd ddu trir trong trucmg hqp ngugc lpi Lap lpi e0ng viQc d6 4a32 Dn H6i
trdn bing cdn lpi d6u gi?
I
cho x,y ld hai so thlrc duong th6a mdn x+ y<1 "3 ri* gi6trinh6 nh6t
ctia bi6u thirc ,F' = x2 + y' *!* 1 .
xy
- u6t