谁帮我出20个八年级上册的因式分解题吧。太感谢了。
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因式分解xy+6-2x-3y=(x-3)(y-2)
4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2
5.因式分解2x2-(a-2b)x-ab=(2x-a)(x+b)
6.因式分解a4-9a2b2=a^2(a+3b)(a-3b)
7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=(x-1)(x+2)^2
8.因式分解ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by)
9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c)
10.因式分解a2-a-b2-b=(a+b)(a-b-1)
11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2
12.因式分解(a+3)2-6(a+3)=(a+3)(a-3)
13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2)
abc+ab-4a=a(bc+b-4)
(2)16x2-81=(4x+9)(4x-9)
(3)9x2-30x+25=(3x-5)^2
(4)x2-7x-30=(x-10)(x+3)
35.因式分解x2-25=(x+5)(x-5)
36.因式分解x2-20x+100=(x-10)^2
37.因式分解x2+4x+3=(x+1)(x+3)
38.因式分解4x2-12x+5=(2x-1)(2x-5)
39.因式分解下列各式:
(1)3ax2-6ax=3ax(x-2)
(2)x(x+2)-x=x(x+1)
(3)x2-4x-ax+4a=(x-4)(x-a)
(4)25x2-49=(5x-9)(5x+9)
(5)36x2-60x+25=(6x-5)^2
(6)4x2+12x+9=(2x+3)^2
(7)x2-9x+18=(x-3)(x-6)
(8)2x2-5x-3=(x-3)(2x+1)
(9)12x2-50x+8=2(6x-1)(x-4)
40.因式分解(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-
4.因式分解x2(x-y)+y2(y-x)=(x+y)(x-y)^2
5.因式分解2x2-(a-2b)x-ab=(2x-a)(x+b)
6.因式分解a4-9a2b2=a^2(a+3b)(a-3b)
7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=(x-1)(x+2)^2
8.因式分解ab(x2-y2)+xy(a2-b2)=(ay+bx)(ax-by)
9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=2y(a-b-c)
10.因式分解a2-a-b2-b=(a+b)(a-b-1)
11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=[3a-b-2(a+3b)]^2=(a-7b)^2
12.因式分解(a+3)2-6(a+3)=(a+3)(a-3)
13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=-(x+1)(x+2)
abc+ab-4a=a(bc+b-4)
(2)16x2-81=(4x+9)(4x-9)
(3)9x2-30x+25=(3x-5)^2
(4)x2-7x-30=(x-10)(x+3)
35.因式分解x2-25=(x+5)(x-5)
36.因式分解x2-20x+100=(x-10)^2
37.因式分解x2+4x+3=(x+1)(x+3)
38.因式分解4x2-12x+5=(2x-1)(2x-5)
39.因式分解下列各式:
(1)3ax2-6ax=3ax(x-2)
(2)x(x+2)-x=x(x+1)
(3)x2-4x-ax+4a=(x-4)(x-a)
(4)25x2-49=(5x-9)(5x+9)
(5)36x2-60x+25=(6x-5)^2
(6)4x2+12x+9=(2x+3)^2
(7)x2-9x+18=(x-3)(x-6)
(8)2x2-5x-3=(x-3)(2x+1)
(9)12x2-50x+8=2(6x-1)(x-4)
40.因式分解(x+2)(x-3)+(x+2)(x+4)=(x+2)(2x-
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