... 5 THI TH I HC V CAO NG NM 2010 Mụn thi: TON Thi gian: 180 phỳt (khụng k thi gian phỏt ) I. PHN CHUNG (7 im) Cõu I (2 im): Cho hm s yxmxmx 32 2(3)4=++++ (C m ). 1) Kho sỏt s bin thi n ... (ABCD). MCN a S 2 6 4 D = , MCP a S 2 4 D = ị MCP MCN S S 6 cos 6 D D j ==. Cõu V: ã T gi thit ị xyz yzxzxy 1++= v xyzxyzxyyzzx 222 =++++ ị xyz 111 1++Ê. ã Chỳ ý: Vi a, b > 0, ta ... 3). Gi s d: axbyab 22 (2)(3)0(0)-+-=+ạ. Gi ddOdddId 122 (,),(,)==. Trn S Tựng T gi thit, ta suy ra c: RdRd 2222 1122 -=- dd 22 21 12-= aabab abab 22 2222 (623)(23) 12 ---- -=...