1、 1 A (100 ) 3 10=30 1 2 A 5 B 1 C 6 D 6 2 A a 3 a 2 a B a 3 a 2 a 5 C (a 3 ) 2 a 5 D a 2 a 3 a 63 2 2 1 ab A - 2 1 2 B - 2 1 3 C 2 1 2 D 2 1 3 4 A B C D 5 sin = 2 3 = A 75 B 60 C 45 D 30 6 3 A A 3 B 3 1C D 7 B A C D 2 8 A 7 B 0.5 C 2 D 0.151151115 1 1 5 ( 9 A 3 15 2 B 4 15 3 C 5 15 4 D 16 15 14 10 a
2、 2 |1 |aa A 1 B 1 C 12 a D 21 a 3*10=30 11 9 2 5 0 2 . 12 2 -8 2 5 2 13 2m 2m 3m m 14 0.020 5.2 15 2009 726000000 16 3 aa = 17 a b |a 2| ( b 12 ) 2 0 ab 18 A= 2 xy 4 B x y 2AB 19 23 2 mn x y x y 1 - 3 mn 20 1 1 0 a 10 3 40 21 5 | |+ 2013 0 1 22 (5 ) 2 2 2m n m n m n m 23 5 22 6 mn m+n=3, m-n 24 (5 )
3、 ABC C 90 c 8 3 A 60 B a b 4 . 25 10 AB DE .AB=5m AB BC=3m. 1 DE 2 AB DE 6m DE 26 10 1 3 =1 2 1 3 +2 3 =3 2 1 3 +2 3 +3 3 =6 2 1 3 +2 3 +3 3 +4 3 =10 2 n n B 50 1 ( ) x x x x x x x x x x 1 1 4 4 2 4 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3 3 2 2 3 xy y x y x y x y x xy xy y x A E D C B 5 3 2a 3 3 4 A P 6 400 B P P 6 H G F E D C B A5 AB D DE 3 BD G DG 5 GH 5 . 1.7 AB 0.1
