Can b{Jcoi thi khong giiii thich gi them.. HQ va ten thi sinh: S6 bao danh: ..[r]
Trang 1DE TID CHINH THUC
KY THI CHQN HQC SINH GI(~)IcAPHUnN TRUNG HQC CO SO, NAM HQC 2018-2019 Mon: ToAN
Thai gian: Isnphut (khong k J thai gian giao tJ€)
Ngay thi: 19/02/2019 (D€ thi co 01 trang , g6m 05 hili)
Bili 1.(4,0 tJiJm)
x( ~x +4.Jx - 4 +~x -4.Jx -4)
x2 -8 +16 1) Rut gon A Tim x dS A dat gia tri nho nhat
2) Tim tat cacac gia tri nguyen cuax dS A co gia t ri nguyen
Bili 2 (5,0 tJiJm)
Trong m~t phang toa dQ Oxy, eho duong thang (d): mx +(2-3m)y + m-l= O
1) Tim diSm e6 dinh rna duong thang (d) luon di qua voi moi s6 thuc m
2) Tim m dS khoang each tu g6c toa dQ 0 dSn duong th~g (d) la 100 nhat,
3) Tim m dS duong thang (d) cit cac true toa dQ Ox, Oy Idn hrot tai A, B sao eho tam giac OAB can
Bili 3 (4 ,0 tJiJm)
1) Giai phuong trinh: .J x +9 + 2019.Jx + 6 =2019 + ~(x + 9)(x + 6)
2) Co bao nhieu s6 nguyen duong co 5 chfi s6 abede sao cho abe-(10d+e) chia hSt cho 101?
Bili 4 (3 ,0 tJiJm)
Cho hinh thang vuong ABCD co A = D =90° ,AB =9cm, CD = 16cm,BC = 25em DiSm E thuoc canh BC sao cho BE =AB
1) Chung minh: AED =90°
2) Tinh AE, DE
Bili 5 (4 ,0 tJiJm)
Cho dirong tron tam 0 duong kinh AB =2R va C la diSm chinh giua cung AB Lay diSm M tuy y tren cung BC (M khac B) GQiN la giao diSm cua hai tia OC va
BM GQi H, I Idn luqt la trung diSm eua cae do~ th~ng AO, AM va K la giao diSm eua cae duang th~ng BM vai HI
1) ChUng minh r~ng A, H, K, N cung n~m tren mQtduang tron
2) Xae djnh vi tri eua di~m M tn,n eungBe (MkbaeB)sao cho AK = R:O _ ~T - -
-Thi sinh khong iluf1c sir dfUlg tlU Ii?u ,maytinh ciun lay. Can b{Jcoi thi khonggiiiithich gi them.