S6' Ghio due va Dao tao B~e Giang DE THI OLYMPIC ToAN cAP TiNH B~C TIltU HQC NA.M HQC 2010-2011 Tho; gian lam bai: 90 phut (khong ki thin gian giao ilJ) ~ 5~S. pRAN I: Vi~t dap sA dung ciia cac bai toan sau. ,X'Bai1 (2,0 iliim): Bi~t 2a3be4d5la sa tu nhien co 8 chtr sa. Tim x khi: x x 20112011 = 2a3bc4d5 x 2 x 402,2 x 2,5 B '·2/20i/ix .~ Tinh ., M b·t M 1005 (1 1 1 1 1 1) 'v ai", em/: gmtri cua , let: = + -+-+-+-+ + + ('- . 3 15 35 63 9603 9999 Bili 3 (2,0 iliim): Co mot cai d6ng h6 cir 2 gio lai cham~ phut. Dung 7 gio sang horn nay ngiroi ta lAy lai gio theo gio dung. Tinh xem it nhAt bao nhieu ngay nfra no lai chi gio dung vao hie 7 gio sang? f- Bili 4 (2,0 iliim): MQt v~ dQngvien di thi b~n sung. Bi~t rfuIg ngiroi do da ~fu hon I} vien dan, vien dan nao cling tnmg mot trong cac yang 8 hoac 9 ho~c 10 diem va moi yang do trung it nhat la 2 vien dan tro len. sa di~m v~ dQng vien do dat diroc' la 103 di~m. H6i v~ dQngvien do da b~ bao nhieu vien dan va k~t qua cac yang bfu th~ nao? f Bili 5 (2,0 iliim): Hinh ve ben g6m 16 hinh vuong bang nhau. . .l· :.: H6i co bao nhieu hinh chtr nhat tao thanh tir cac hinh vuong - 'i do ma co chi@u dai gAp 2 IAnchieu rQng? ' , , I , ' : I) II /' ' pRAN II: Trinh bay bai giai cac bai toan sau. Bili 1 (2,0 diim): Cho bieu tlnrc: A=1024*512*256* 1~8*64 32* 16*8*4 *2* 1 r '", , '" ., Hay thay dAu * bang dAuphep tinh cong (+) hoac tnr (-) d~ A = 1791. x:B.ili2 (2,0 diim);' MQtnhom hQCsinhg6m;~ng, Thuy, Thuan~ Minh, Thanh clinggophoa de diroc met 00 earn vao lo hoa coo lop, Biet so hoa coo Long neu them ! bong hoa thi dung bfu1g .!. 00, sa hoa coo Thuy n~u bot 1 bong hoa thi dung bfu1g .!. 00, sa hoa coo Thuong n~u 4 5 them 1bong hoa thi dung bfu1g~ 00, sa hoa cooMinh n~ubot 1bong hoathidungbfu1g _1 00. 10 20 Thanhco 8 bong hoa H6i m6i ban Long, Thuy,Thirong,Minh mang d~nmAybonghoa? YBili 3 (2,0 iliim): MQt gia dinh nong dan nuoi trong thuy san diroc 3 nam, m6i nam thu hoach m{>tIAn.Ngiroi chu nhan thAytrong nam thir hai va nam thir ba dffthu vS duoc cit ca 285 000 000 d6ng. Tinh doanh thu m6i nam cua gia dinh do, bi~t rfuIg doanh thu nam thir hai bang 90% doanh thu nam thir ba va bang 120% doanh thu nam thir nhAt. Bili 4 (2,0 iliim): Co 80 hoc sinh thi giai toan, dS thi g6m 4 cau. Trong do co 16 ban sai cau 1; 4 ban lam sai cdu 2; 61 ban lam dung cau 3 va 39 ban lam dung cau 4. D~c bi~t la khong co ban nao lam dung ca 4 cau . H6i co bao nhieu ban lam dung ca hai cau 2 va 3? Bili 5 (2,0 iliim): Cho tam giac ABC co dien tich 69cm 2 • Tren AB lAytrung di~m P, tren BC lAytrung diem Q. Nai CP va AQ c~t nhau tai O. Tinh dien tich tam giac AOC. H~t . • . Tim x khi: x x 20112011 = 2a3bc4d5 x 2 x 402,2 x 2 ,5 B '·2/20i/ix .~ Tinh ., M b·t M 10 05 (1 1 1 1 1 1) 'v ai", em/: gmtri cua , let: = + -+ - +-+ -+ + + (&apos ;- . 3 15 35 63 9603 9999 Bili. TIltU HQC NA.M HQC 201 0-2 011 Tho; gian lam bai: 90 phut (khong ki thin gian giao ilJ) ~ 5~ S. pRAN I: Vi~t dap sA dung ciia cac bai toan sau. ,X'Bai1 (2,0 iliim): Bi~t 2a3be4d5la sa tu nhien. sau. Bili 1 (2,0 diim): Cho bieu tlnrc: A=1024 *51 2* 256 * 1~8*64 32* 16*8*4 *2* 1 r '", , '" ., Hay thay dAu * bang dAuphep tinh cong (+) hoac tnr (-) d~ A = 1791. x:B.ili2 (2,0 diim);' MQtnhom