1、 4 90 100 2 20 1 ( ) A 2a 1 B 3y 5 C 3 7 10 D x 2 x 1 2 ( ) A 4x 5 3x 2 4x 3x 2 5 B 2 3 x 1 1 2 x 3 4x 6 3x 18 C 3 x 1 2 x 3 3x 1 2x 6 D 3x 2 x 3 23 x 5 ( ) A 5x 2 7x 8 B 5x 2 7x 8 C 5x 2 7x 8 D 5x 2 7x 8 4 20 21 ( ) A. 26 B 27 C 28 D 29 5 2014 1.2 2 “6.1 ” 8 9 60 87 x A 1.2 0.8x 2 0.9(60 x) 87 B l.
2、2 0.8x 2 0.9(60 x) 87 C 2 0.9x l.2 0.8(60 x) 87 D 2 0.9x 1.2 0.8(60 x) 87 6 (m 1)x m 3 0 x m ( ) A 1 B 1 C 1 D 0 1 7 ( ) A 6 7 3 B 2 C 3 8 4 5 D 20% 15 8 1 (2 x) 1 x 2x 2 7 ( ) A 5 B 5 C 1 D 1 9 1998 12 22 ( ) A 15 B 16 C 17 D 18 10 50 cm 10 ( ) A 40 cm 2B 500 cm 2C 600 cm 2D 4 000 cm 2 3 24 11 x 2
3、2 _ 12 42 cm 3 cm xcm _ 13 14 9a x b 3 7a 3n 4 b 3 x _ 15 m _ 35 3 m 2 16 (1) 2 48% _ _ 17 x 2 3 3(m 3 4 x) 2 3 x 5m m _ 18 7h 20 km 5 _km 56 19 6 (1)5 x 8 6 2x 7 5 (2) 2 2 3 1 46 xx 20 6 x x 1 3 x 3? 21 7 2004 4 5 K120 44 km/h 22 6 2 000 10% 20% 3.5% 23 8 x 2 3 2 3 53 x x 1 3 3 2 4 n x n n 2 5 3 8
4、n 24 6 a b c d ab ad bc cd 3 5- x 7 2 7 x ? 25 8 2014 1 2 1 1 16 25 26 10 9W 0.009 kW 49 40 W( 0.04 kW) 18 2 800h. 0.5 (1) xh x (2) (3) 3000 h 2800 h 1 A 2 B 3 A 4 C 5 B 6 B 7 C 8 A 9 D 10 A 11 2x 4 0( ) 12 2x (x 3) 42 13 200 14 2 15 1 316 26 24 17 1 418 350 19 (1)x 11 (2)0 20 3. 21 4 24 2.4 h 22 990 1080 23 100. 24 x= 2 25 9 7 26 (1)(49 0.0045x) (18 0.02x) (2) 2000 h 2 000 h 2 000 h (3) 2800 h 200 h
