NG ÔN T P KI M TRA CH D NG : GI I B T PH NG TRÌNH 1) 2x2 –5x + < ; 2) –5x2 –4x + 12 < ; 5) 3x2 – 4x ; 6) 15 x2 1 x ; 6 x 1 x2 x 30 9) 3x2 x 0 12) x2 x 15) x 0 ( x 5)(6 x) 7) x2 x x x2 0 13) x2 x 14) x 0 3x x x2 x 15 0 2x 17) x2 x 0 x2 x 21) 3x2 x 11 1 x2 x x2 x 15 x2 3x 10 0 0 27) 2x 1 x2 3x2 x 4x 3 2 x 29) 30) x x 4(2 x) x2 x 8x 1 x 33) 3(1 x) 32) 2x x 1 D NG : GI I BPT CH A N D ID UC N 26) B A B ; A B 2 x2 x H BPT) x x6 x2 x 0 24) x 3 x2 3x 3x 23) 2 x x 8) x2 20 x 25 ; 11) (5 – x)( 16x2 – 8x + 1) < x2 x 0 19) x2 x2 x 0 x 1 x2 x 5 4) –2x2 + 3x -7 > 10) (3x – x2)(x2 – 6x + 9) > 16) 3x 18) 0 x x 20) 3) 16x2 +40x + 25 > ; 22) x3 x 13 x x x2 0 25) x2 x 2 x2 0 x2 x x 1 31) 3x x x x 1 0 34) 3x x 28) A A B A B B ; A B B A B2 A B2 3) x x2 3x 1) x2 x 12 x 2) 21 x x2 x 4) 5x x2 x ; 5) x2 x x 6) 7) x2 x x2 x 8) x2 3x x2 x 9) x2 x x2 10 x 11 10) x2 x 1 x 13) x2 3x 10 x Ôn t p ch ng - 11) 3x 3x2 5x 14) x2 x x ( x 6)( x 12) x 12) x2 x x2 x 15) x2 x2 3x 3x GV: Thái V n D i s 10 c b n ThuVienDeThi.com ng D NG : GI I BPT CH A N TRONG GIÁ TR TUY T I A B A B | A| B | A| B ; ; | A|| B | ( A B)( A B) A B A B 1) | x | x 2) | x | x 3) | 3x | 2 x 4) | 5x | 6 x 5) | x | x 6) | 3x | | x 3| 7) x2 | 5x | 8) x | x2 3x | 9) | x2 1| 2 x 10) | x2 x || x2 x | 11) | x2 3x | x2 x 12) | x | x2 13) | x | 14) | 3x | 15) | 3x | 16) |1 5x | 2 17) | x | 1 18) | x | x2 x 1 19) x x 20) 2x 1 | x3| 21) | x 2| 3 x 5x D NG : BÀI TOÁN CH A THAM S f ( x) x a ; f ( x) x a b) f ( x) x a ; f ( x) x a a) T đó: 1) f ( x) vô nghi m f ( x) 0, x 2) f ( x) vô nghi m f ( x) 0, x 3) f ( x) vô nghi m f ( x) 0, x 4) f ( x) vô nghi m f ( x) 0, x Bài 1: Xác đ nh m đ BPT nghi m v i m i x: a) x2 (m 3) x m b) 2 x2 (m 2) x m c) (2m 1) x2 2(m 1) x d) mx2 2(m 3) x 3m e) (m 2) x2 (3m 1) x 4m f) (m 1) x2 (m 1) x 2m Bài Xác đ nh m đ b t ph ng trình sau vô nghi m: a) mx2 (2m 1) x m b) (m 1) x2 2(m 3) x m c) mx2 + (m – 1)x + m – < d) (2m – 5)x2 – 2(2m – 5)x + ≥ Bài 3: Tìm giá tr m đ ph ng trình: a) x2 + 2(m + 1)x + 9m – = có hai nghi m phân bi t b) x2 – 6m x + – 2m + 9m2 = có hai nghi m d Ơn t p ch ng - ng phân bi t GV: Thái V n D i s 10 c b n ThuVienDeThi.com ng ... – = có hai nghi m phân bi t b) x2 – 6m x + – 2m + 9m2 = có hai nghi m d Ôn t p ch ng - ng phân bi t GV: Thái V n D i s 10 c b n ThuVienDeThi.com ng ... | 1 18) | x | x2 x 1 19) x x 20) 2x 1 | x3| 21) | x 2| 3 x 5x D NG : BÀI TOÁN CH A THAM S f ( x) x a ; f ( x) x a b) f ( x) x ... | x | x 6) | 3x | | x 3| 7) x2 | 5x | 8) x | x2 3x | 9) | x2 1| 2 x 10) | x2 x || x2 x | 11) | x2 3x | x2 x 12) | x | x2 13) | x | 14) | 3x |