Bài tập Đại số lớp 9

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Xin giới thiệu tới các bạn học sinh Bài tập Đại số lớp 9, giúp các bạn ôn tập kiến thức dễ dàng hơn và nắm các phương pháp giải bài tập nhằm chuẩn bị thật tốt cho kì thi sắp diễn ra. Mời các bạn cùng tham khảo!

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Nội dung Text: Bài tập Đại số lớp 9

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1: 2mx a/ hai ng (x1 x 2 ) 2 7 t x1, x2 A x1 x 2 1 A = x12 x 22 x12 x 2 x1x 22 11: Cho x2 4x + m a/ x1 2 1> x2 . x2 3 5 2 A 2: 3x m x x x12 x22 2 2 1 2 a/ 1, x2 12: Cho x2 mx + m a/ x13 x 32 27 . x1, x2. 3: Cho x2 (m 1)x m 2 = 0 a/ 2 x1 x2 7 2 x1 2 x2 A x1, x2. x12 x22 2 1 x1 x2 B x12 4 x1 x2 x22 13: Cho x2 4: 2x m2 + 4m a/ t x1, x2 x12 x 22 4x1x 2 3 A x13 x 32 . . 5: 2mx 3m2 + 4m 14: 1)x m a/ hai m x1, x2 x1, x2 A x1 x 2 A x12 x2 x1 x22 3x1 x2 1 6: C (2m + 1)x + a/ 15: Cho x2 2x + m x1, x2 a/ x1, x2. 7x1x 2 x12 x 22 2 x12 x 22 x12 x 22 3x1x 2 :x (2m 1)x + m2 m a/ . 16: Cho x2 (m + 2)x + m x1 ; x2 R. 2 2 b/ = 6x1x2 x x 1 2 x1, x2 : Cho (m + 2)x m 10 A a/ 1, x2 x x22 2 1 . 17: Cho 2(mx + 1) x2 b/ A = x12 x 2 x1x 22 : x2 6x m2 + 8m 7 = 0 x1, x2 6 A x x1 x2 x22 2 1 1, x2 sao 3 3 18: Cho x(x 2m) = 2 x x1 2 2 : Cho x (2m 1)x m2 0 x1, x2 x1, x 2 . 48 K 2 2 x1 , x 2 x13 x 32 = 0. x 1 x 6 x1 x2 2
19: 2mx 4m : Cho x2 2mx + m2 m + 1 = 0 a/ 1, x2 a/ 2 A x x x1 x2 1 2 2 b/ 20: (2m 1)x + m2 x1, x2. a/ x1 ; x2 . 2 A x1 x2 x1 x2 b/ x 1 2m 1 x2 8 : Cho x2 (2m + 3)x + m2 + 3m + 2 = 0 21: (2m . a/ x1 ; x2 . b/ x 2 2m 1 x2 8 17m 0 b/ 1 x1, x2 R. : Cho x2 a/ Ch x1, x2 : Cho x2 4x + 5m2 + 2m 3 = 0 1x2 4x1 = 2. x2 . 1, 23: 2 2 3 x1 x2 x x a/ x=- 1 2 . b/ : Cho x2 2(m + 4)x + m2 8=0 x1, x2 x13 x23 35 . 1, x2 . 2 2 24: Cho 3(mx + 1) x2 x 1 x 2 x1 x 2 x1, x2 : Cho x2 2(m 1)x + m2 4m 1=0 18 1, x2. A 2 x1x 2 x12 x 22 x1 4 x1 x2 x22 25: Cho x2 (m + 1)x m : Cho x2 x1, x2 x1, x2 P x12 x22 x1 x2 3x1 3x2 9 A 2 2 x1 x x1 x2 3 2 26: Cho x2 x1, : Cho 2(mx + 1) x2 x2 1, x x 2 2 x2 1 2 27: Cho x2 (m 1)x + 2m x1, A x12 4 x1 2 x22 4 x2 2 2 x12 x22 x2 : Cho x2 4x + m = 0 x1 x2 5 a/ x1, x2. . x2 x1 2 3x1 2x2 = 7. : Cho x2 2x + m 3 = 0 : Cho x2 2(2m + 1)x + 3m2 + 6m = 0 x2 . a/ 1, A x12 x22 x12 x22 3x1 x2 x1, x2 x12 x1 x22 x2 14 . x1 = 2x2. : Cho x2 + (2m 1)x + m2 = 0 : Cho x2 (2m 3)x + m2 2m + 1 = 0 x2 . a/ c x1, x2. 1, 1 5x 2 = 16. A x12 2m 1 x2 m2 : Cho x2 2x 2m2 : Cho x2 + 3x + m 1 = 0 x1, x2 1, x2 . 4 4 x1 x 1 1 x2 32 x 2 1 3 x12 4 x22 .
: Cho x2 : x2 a/ x1, x2. a/ 4 4 x x 17 . 1 2 R. : Cho x2 2mx + m2 m b/ x1; x2 x1 x2 x1, x2 : 4x + 2(3 2m)x + m2 3m + 2 = 0 2 x1 x2 8 . a/ 2 : Cho x + 2mx 2m b/ . 2 2 :x 2(m + 1)x + m + 3m 2=0 x1, x2 a/ 1, x2. x1 x2 x22 b/ x12 x 22 x1x 2 22 : x 2 2 2m 1 x 3m2 4 0 : (m 1)x2 2(m m 1) a/ a/ 1, x 2. R. b/ 1 = 0, b/ x1 ; x2 khi x12 x22 2 x1 x2 8 . c/ : x2 2(m 1)x 3 + m2 a/ m. 50: (3m 2)x b/ A=x1x2 + 2x1 + 2x2 nh nh t 3m 1, x2 1 5x2 = 6. 1: 4m 320m2 ? 2 2: . 3: 128m2 2 4: chu vi 140m 1176m ao. 2 5: 5/3 240m ? 6: 2/3 150m2 7: c 280m. 2 8: .000. sau v 12: 286.650.000 ?
1: 2 2 a/ 2x 5x 7 = 0 b/ x 4x 5 + 20 = 0 a/ 2x2 + 5x 7=0 b/ x2 2x 5 + 5 = 0 c/ x 2 3 5 x 15 0 c/ x 2 3 5 x 15 0 d/ 4x4 12x2 + 9 = 0 d/ 9x4 12x2 + 4 = 0 1 2 1 x2 1 2: Cho (P) : y = x (D) : y = x 2 2: Cho (P) : y = (D) : y = x 2 4 2 4 2 3: Cho x2 2mx + m 2 = 0 . 3: Cho x2 3mx + 3m 2 = 0 a/ a/ x1, x2 m. x1, x2 m. x1 x2 , x1 x2 , x12 2 x2 theo m. x1 x2 , x1 x2 , x12 2 x theo m. 2 24 24 A= 2 2 A= x 1 x 6 x1 x2 2 x2 1 2 x 6 x1 x2 2 1: 1: a/ 4x2 + 9x = 0 2 b/ 2y 8 = 0 a/ 2x2 3x = 0 b/ 3x2 + 5x + 1 = 0 c/ x2 + x = 12 d/ 3x2 2x 6 + 2 = 0 c/ (x + 2)2 = 4 x d/ 3x2 2(x 3 + 1) = 0 e/ x 2 2 5 x 10 0 e/ x 2 2 3 2 x 2 6 0 f/ x 2 1 5 x 5 0 f/ 5 x 2 3 1 x 4 3 4 2 4 2 4 g/ x 3x = 2 g/ 3x 2x 20 = 2x 3x2 x2 2 x x 5 4 x2 x 2 h/ h/ 5 3 6 x 1 x 1 x 2 x2 x2 2: a/ (P) : y = . 2: a/ (P) : y = . 2 4 2. . 3: 2 2mx + 2m 1 = 0 3: Cho x2 mx + m 1 = 0 . . a/ x 1, 1, x2 m. x2 theo m. theo m. A = x1x 2 x12 x 22 . A = x1x 2 x12 x 22 1: 1: 3 2 a/ 2 x3 3 x2 = 0 b/ 9t4 4 = 0 a/ x + 27x = 0 b/ 4a4 9a2 = 0 8 c/ (x 3)2 = 10 4x d/ x2 = 2(3 + x 3 ) c/ 9x2 = 4(3x 1) d/ x2 + 5 = x 2 e/ x 2 3 3 2 x 3 6 0 2 e/ x 2 3 x 2 3 0 f/ 6 x2 5 3 6 x 4 6 5