Ôn tập Ttoán khối 8

Bài:
Rút gọn các biểu thức sau:
1, 5x2 -3x(x+2)
2, -4x2 +2x-4(x-5)
3, 3x3 –x2-x(2x2-x+3)
4, x3-5x2+2x(-x2+3x-5)
5, -7x4+5x3-(x2+3x-1)
6, 3x4-4x3+2x(x3-2x2+7x)
7, 3x(x2-x+1)-x(3x2-2x-5)
8, -4x(3x-4)+7x(x-5)
9, (3x+5)(2x-7)
10, (-5x+2)(-3x-4)
11, (x-5)(4x-3)
12, (x2-2x-1)(x-3)
13, (x-5)(-x2+x-1)
14, (2x-1)(2x2-4x-6)
15, (-x-1)(-4x2+2x-6)
16, (-x+3))3x2-6x+9)
17, -5x(x-5)+(x-3)(x2-7)
18, x(x2-x+1)-(x-1)(x2-x)
19, x(x2-5x+2)-(x+3)(x2-2)
20, 4x(x2-x-1)-(x2-2)(x+3)
21, (x-5)(x+7)-(x-4)(x+3)
22, x(x2-x-2)-(x-5)(x-1)
23, (x-1)(x+2)-(x-5)(x+2)
24, (2x-3)(x+4)+(-x+1)(x-2)
25, (-x+5)(x+3)+(2x-1)(x+3)
26,(x+3)(x-1)-(x-7)(x-6)
27, (-x-2)(x+1)-(x-5)(-x+1)
28, 5x((x-3)(x-1)-4x(x2-2x)
29, -4x(x+3)(x-4)-3x(x2-x+1)
30, -3(x+4)(x-7)+7(x-5)(x-1)
31, 4x(x2-x+3)-(x-6)(x-5)
32, (x-6)(3x-1)-2x2(x-2)+x(x-1)(2x+3)-5x(x2-4x+1)
33, (8x-1)(2x-3)-(-x+7)(x-2)-6x(x2-x+3)+(x2-3)(x-4)
34, (-3x+4)(x-2)-x(x2-2)(-4x+1)+(2x-5)(x2-4x)
35, (5x-2)(x+1)-3c(x2-x-3)-2x((x-5)(x+4)+5x(x2-7)
36, -3x2(x-4)+2x(x-1)(-2x+3)-(x-9)(-2x+1)-5(x-1)(x+2)
37, (-2x2+5)(x-6)-4x(x2-7x+2)-2x(x+3)(x-2)-(x3-x2)
38, (x2-3x)(-5x2+x)-x3(x-7)+5x2(x-2)(x-4)-(x+1)(x+3)
39, (-x+4)(x-5)-7x(x2-5x+2)+)-5x+1)(x2-5)+30
40, 3x(x-2)(x+2)-2x(x-3)(x-7)+(x-1)(x2-2x+2)
41, (x-3)(x2-3x)-(4x-2)(-x2+1)-4x(x-7)(x+1)-(x2-x-1)
42, 10(x2-x+1)-(x-5)(2x+1)+5x(x-3)-(-7x2+4x-5)
43, -5x(-2x2+4x-10)+(4x2-2x)(-3x+1)-(-9x3+2x2-x)
44, 7x2-(-3x2+4x-15)+(2x-1))-3x-2)-(x-4)(x+5)
Bài:
T ìm x, biết:
1, 5x(x-2)+3(6-x2)=12
2, 3x(x+1)-4x(x-2)=10
3, 5(x2-3x+1)+(x(1-5x)=x-2
4, 12x2-4x(3x-5)=10x-17
5, 4x(x-5)-7x(x-4)+3x2=12
6, 4x2-2x+3-4x(x-5)=7x-3
7, -3x(x-5)+5(x-1)+3x2=4-x
8, 7x(x-2)-5(x-1)=21x2-14x2+3
9, 3(5x-1)-x(x-2)+x2-13x=7
10, x(10x-15)-2x(x-5)=12
11, 4x(x-5)-(x-1)(4x-3)=5
12, (3x-4)(x-2)=3x(x-9)-3
13, (x-5)(x-4)-(x+1)(x-2)=7
14, 5x(x-3)=(x-2)(5x-1)-5
15, (x-5)(x-1)=(x-1)(x-2)
16, 6(x-3)(x-4)-6x(x-2)=4
17, -(x-3)(x-4)+(x+1)(x-1)=10
18, (2x-1)(x-2)-(x+3)(2x-7)=3
19, (x-5)(-x+4)-(x-1)(x+3)=-2x2
20, (4x+1)(x-3)-(x-7)(4x-1)=15
21, (x+1)(x2-x+1)-x(x2-3)=4
22, (x-3)(x2+3x+9)+x(5-x2)=6x
23, (5x-1)(5x+1)=25x2-7x+15
24, 8x(x-3)-8(x-1)(x+1)=20
25, -4x2(x-7)+4x(x2-5)=28x2-13
26, (4x-5)(x+1)-4(x-1)(x+1)=7
27, (3x-5)(x+1)-(3x-1)(x+1)=x-4
28, (x-2)(x+3)-(x+4)(x-7)=5-x
29, 5(x-3)(x-7)-(5x+1)(x-2)=8
30, 3(x+7)(x-7)-(x-1)(3x+2)=13
31, (x+2)(x+3)-(x-2)(x+5)=6
32, (3x+2)(2x+9)-(x+2)(6x+1) = (x+1)-(x-6)