PRAN I: Vi~t dap s8 dung ciia cac bai toan sau.. Dung 7 gio sang horn nay ngiroi ta lfty lai gio theo gio dung.. BiSt rrmgnguoi do da ~fuIhon I} vien dan, vien dan nao cling trung mQt tr
Trang 1S6' Ghio due vil Dilo tao Biie Giang
DE THI OLYMPIC ToAN cAP TiNH B~C TIEU HQC
NA.MHQC 2010-2011
Tho; gian lilm bili: 90 phut (khong ki thin gian giao ilJ) ' t s ~s
PRAN I: Vi~t dap s8 dung ciia cac bai toan sau
f'Bili 1 (2 , 0 i liim) : BiSt 2a3be4d5 hi s6 tv nhien co 8chfr s6 Tim x khi:
x x 20112011 =2a3bc4d5 x 2 x 402,2 x 2,5
B'· 2f10 ;I x ~ Tinh , M b·t M 1005 (1 1 1 1 1 1)
\.; al \M, ule m/: gta tn cua , let = + -+-+-+-+
Bili 3 ( 2 , 0 i liim) : Co mQt cai d6ng h6 cir 2 gio lai cham~ phut Dung 7 gio
sang horn nay ngiroi ta lfty lai gio theo gio dung Tinh xem it nhat bao nhieu
ngay ntra no lai chi gio dung vao luc 7 gio sang?
' f Bili 4 (2 , 0 i liim ): MQt v~ dQng vien di thi blfusung BiSt rrmgnguoi do da ~fuIhon I}
vien dan, vien dan nao cling trung mQt trong cac yang 8 hoac 9 hoac 10 diem va moi
vong do trung it nhat la 2 vien dan tro len, S6 diSm van dQngvien do dat dirc ' la 103
diSm.Hoi v~ dQng vien do dablfu bao nhieu vien danva kSt qua cac vong blfu thS nao?
Hoi co bao nhieu hinh chfr nhat tao thanh tir cac hinh vuong
pRAN II: Trinh bay bai giiii cac bai toan sau
Bili 1 (2,0 iliim): Cho bieu thirc:
A = 10r24 * 5.1~* 2~6 * 1~8 *0,32 * 16,* 8.*1*2 * 1
Hay thay dftu * bang dftu phep tinh cong (+) hoac tnr (-) dSA =1791
) B.ili2 (2 , 0 i liim); ' MQtnhom hQCsinh g6m;~ng, Thuy, Thuon~,Minh,Thanh cung gop hoa
de dirocmot 00 earn vao lo hoa cua lap BietsO hoa cua Long neu them !bong hoa thi dung b~g !00, s6 hoa cua Thtiy nSu bot 1 bong hoa thi dung b~g !00, s6 hoa cua Thuong nSu
them 1bonghoathidung b~g ~ 00, s6 hoa cua MinhnSubot 1 bong hoa thidung b~g _ 00
Thanhco8 bong hoa Hoi m6i ban Long, Thuy, Thuong, Minh mang dSnmftybong hoa?
YBili 3 (2,0 i liim) : MQt gia dinh nong dan nuoi trong thuy san diroc 3 nam, m6i nam thu hoach mot l~ Ngiroi chu nhan thfty trong nam thir hai va nam thir ba da thu vS duoc cit
ca 285 000 000 d6ng Tinh doanh thu m6i nam cua gia dinh do, biSt r~g doanh thu nam
thirhai bang 90% doanh thu nam thir ba va bang 120% doanh thu nam thir nh~t
Bili 4 (2,0 i liim): Co 80 hoc sinh thi giai toan, dS thi g6m 4 cau Trong do co 16 ban sai
cau 1; 4 ban lam sai cau 2; 61 ban lam dung cau 3 va 39 ban lam dung cau 4 D~c biet la
khong co ban nao lam dung ca 4 cau Hoi co bao nhieu ban lam dung ca hai cau 2va 3?
Bili 5 (2 ,0 iliim) : Cho tam giac ABC co dien tich 69cm2 • Tren AB lfty trung diSmP,
tren BC I tytrung diSm Q N6i CP va AQ c~t nhau tai o Tinh dien tich tam giac AOC
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