2017届高考数学一轮复习第七章不等式7.2不等式的解法课时练理.doc

1 2017 7.2 45 x 2 x 2 1 0 x f(3 x 2 ) 3 3 x 2 0 2 (3 x 2 )2 3. x f(3 x 2 )0 m 1,1 x _ ( 1) (3 (1 x)m x 2 2x 10. f(m) (1 x)m x 2 2x 1 m f(m) 1,1 0 f f x 2 x 20 x 2 3x0 x2 x3 x3 x ( 1) (3 10 x ax b0 ( 1) x (ax b)(x 2)0 _ ( 1,2) a b0 (x 1)(x 2) 1. f(2) f( 1) 1 x 2 2 1 2 8. f(x) a(x 1 2 ) 2 8 f(2) 1 a 4. f(x) 4(x 1 2 ) 2 8. f(x) 1 4x 2 4x 7 1 x 2 x 24 x|xb (1) a b (2) ax 2 (ac b)x bc4 x|xb x1 1 x2 b ax 2 3x 2 0 b1. 1 b 3 a b 2 a . a 1 b 2.(2) x 2 (2 c)x 2c2 x|20 x 1 4( a 2 a 1) 1 2 ax 2 bx c0 _ 1 2 2 2 1 2 ax 2 bx c 0 a0 2x 2 5x 2 2 k (2) x x R x 1 k k (3) R k (4) k (1) x|x 2 k0 4 24k 2 k 6 6 .