Cho hinh vu6ng ABCD c6 cAnh bang a.
Trang 1PHoNG GrAo DUC vA EAo rAo nmN cuAu
or rnr voNG r, cHgN Hec srNH cr6t nuvpN Lop s
NAM HQC 20r4-20rs Mdn Tofn - (Thli gian ldm bdi 150 phrit)
lf CAu 1 (6 diom)
1 Tinh gi6 tri cria bitiu thr?c: A: J4iJj *rfi -+{z {
2 Cho bi6u thric: p : 2* *J - I U
x-2 x'-5x-t6 x-3
a) Tim ttiOu kiQn cta x ee p cO nghia vd rut ggn biO p
b) Tim tht ch circ gi|tri cria x rt6 p nguyOn q+,t
;;,'::':7' 7=!>z 'I
2 Tim nghiQm nguy6n tO cria phuong trinh: x, - 2y, : 1 1)t '0
- -af-etu-f {fiJi etTr)
-1 Cho hinh vu6ng ABCD c6 cAnh bang a LAy di0m M toy y trOn ducrng ch6o AC,
ke ME I AB, MF l- BC X6c tl1nh vi tri cria M tr0n ducrng ch6o AC AC Oi-en ticfr
ADEF nh6 nh6t, tim gi6 tr! 116.
Chung Tinh ring: AB.AE-+ AD.AF : AC'
Q cau s (2 dicm)
Cho ba sd a, b, c th6a m[n a + b + c :0 vd m6i sO eO 16n hcyn - 1 vd nh6 hcrn 1.
Chringminhrdng: a2 +b' + c' <2.
lt
d," +/
n rl)
^rrr/'1*cst td/'c
MW
ftln'furta <2
) f
^'+ '('' C7
6
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