1、 2018 10 3 30 1 2 3 4 5 6 7 8 9 10 1 A 2 2 1 0 x x B 2 0 ax bx c C (x 1)(x 2) 1 D 22 3 2 5 0 x xy y 2 2 2 5 0 xx A 2 16 x B 2 16 xC 2 29 x D 2 29 x 3 2 23 yx =- A B C x D y 4 0 3 3 2 x x . A B C D 5 y x 2 2x ( ) 6 y 2x 2 mx 8 m ( ) A 8 B 8 C 6 7 200 288 A % 10 B % 15 C % 20 D % 25 8 y= 2 1 x 2 3 2 A
2、 y= 2 1 (x 3) 2 2 B y= 2 1 (x 3) 2 +2 C y= 2 1 (x+3) 2 2 D y= 2 1 (x+3) 2 +2 9 a b a 2 +b 2 a 2 +b 2 +2 =4 a 2 +b 2 A -2 B 4 C -2 4 D 2 10 y=ax 2 +bx+c 2a b m ma+b 1 ( 3 24 ) 9 m x 5 ) 3 ( 7 2 x x m m 10 2 ax y 3 5 a= . 11 5 ) 3 )( 1 ( 2 2 2 2 y x y x 2 2 y x 12 100 m 60 m 600 m x m x 20 000 m2 _ 13
3、 _ _ _ _. 14 c x x y 8 2 x , c = _ . 15 y ax 2 bx c x A(1,0) B(3,0) y C(0,3) _ 15 16 y (x h) 2 k _ 16 66 17 15 1 0 1 5 2 x x 2 2 ( 3) 5(x 3) x 3 2 ( 2) 4 0 x 18 x (2m 1)x 2 3mx 5 0 x 1 m 7 19 y ax 2 2x |a| 4 (0 3) (1) 4 (2) x y 4 20 45m 80m , 750m 2 ? 8 21 10 500 1 20 (1) 6000 4 (2) 4 22 a b a 2 b 2 (1) 4 3 (2) (x 2) 5 0 x 8 23 ( 140 km/h) 10 10 20 30 40 50 60 /m 0 0.3 1.0 2.1 3.6 5.5 7.8 (1) x y 4 (2) 4 (3) 46.5 m 4
