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46道八下因式分解或计算!

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46道八下因式分解或计算!
46道八下因式分解,计算都可以.46道!,急用
(一)填空
1.一个多项式若能因式分解,则这个多项式被其任一因式除所得余式为_________.
2.变形(1)(a+b)(a-b)=a2-b2,(2)a2-b2=(a-b)(a+b)中,属于因式分解过程的是________.
3.若a,b,c三数中有两数相等,则
a2(b-c)+b2(c-a)+c2(a-b)的值为_________.
4.12.718×0.125-0.125×4.718=_________.
5.1.13×2.5+2.25×2.5+0.62×2.5=_________.
6.分解因式:a2(b2-c2)-c2(b-c)(a+b)=_________.
7.(a-2b)(3a+4b)+(2a-4b)(2a-3b)=(a-2b)·( ).
8.若a+b+c=m,则整式m·[(a-b)2+(b-c)2+(c-a)2]+6(a+b+c)(ab+bc+ca)可用m表示为_______________.
9.(2x+1)y2+(2x+1)2y=_________.
10.(x-y)n-(x-y)n-2=(x-y)n-2·_________.
11.m(a-m)(a-n)-n(m-a)(a-n)=_________.
12.x(m-n)+(n-m)y-z(m-n)=(m-n)( ).
13.
(x+2y)(3x2-4y2)-(x+2y)2(x-2y)=________.
14.21a3b-35a2b3=_________.
15.3x2yz+15xz2-9xy2z=__________.
16.x2-2xy-35y2=(x-7y)( ).
17.2x2-7x-15=(x-5)( ).
18.20x2-43xy+14y2=(4x-7y)( ).
19.18x2-19x+5=( )(2x-1).
20.6x2-13x+6=( )( ).
21.5x2+4xy-28y2=( )( ).
22.-35m2n2+11mn+6=-( )( ).
23.6+11a-35a2=( )( ).
24.6-11a-35a2=( )( ).
25.-1+y+20y2=( )( ).
26.20x2+( )+14y2=(4x-7y)(5x-2y).
27.x2-3xy-( )=(x-7y)(x+4y).
28.x2+( )-28y2=(x+7y)(x-4y).
29.x2+( )-21y2=(x-7y)(x+3y).
30.kx2+5x-6=(3x-2)( ),k=______.
31.6x2+5x-k=(3x-2)( ),k=______.
32.6x2+kx-6=(3x-2)( ),k=______.
33.18x2-19x+5=(9x+m)(2x+n),则m=_____,n=_____.
34.18x2+19x+m=(9x+5)(2x+n),则m=_____,n=_____.
35.20x2-43xy+14y2=(4x+m)(5x+n),则m=_____,n=_____.
36.20x2-43xy+m=(4x-7y)(5x+n),则m=_____,n=_____.
38.x4-4x3+4x2-1=_______.
39.2x2-3x-6xy+9y=________.
40.21a2x-9ax2+6xy2-14ay2=________.
41.a3+a2b+a2c+abc=________.
42.2(a2-3ac)+a(4b-3c)=_________.
43.27x3+54x2y+36xy2+8y3_______.
44.1-3(x-y)+3(x-y)2-(x-y)3=_______.
45.(x+y)2+(x+m)2-(m+n)2-(y+n)2=_______.
46.25x2-4a2+12ab-9b2=_______.
47.a2-c2+2ab+b2-d2-2cd=_______.
48.x4+2x2+1-x2-2ax-a2=________.
50.a2-4b2-4c2-8bc=__________.
51.a2+b2+4a-4b-2ab+4=________.
或者
1.因式分解8-2x2= .
2.因式分解9x2-30x+25= .
3.因式分解xy+6-2x-3y=
4.因式分解x2(x-y)+y2(y-x)=
5.因式分解2x2-(a-2b)x-ab=
6.因式分解a4-9a2b2=
7.若已知x3+3x2-4含有x-1的因式,试分解x3+3x2-4=
8.因式分解ab(x2-y2)+xy(a2-b2)=
9.因式分解(x+y)(a-b-c)+(x-y)(b+c-a)=
10.因式分解a2-a-b2-b=
11.因式分解(3a-b)2-4(3a-b)(a+3b)+4(a+3b)2=
12.因式分解(a+3)2-6(a+3)=
13.因式分解(x+1)2(x+2)-(x+1)(x+2)2=
abc+ab-4a= .
14.16x2-81= .
15.9x2-30x+25= .
16.因式分解x2-20x+100= .
17.因式分解x2+4x+3= .
18.因式分解4x2-12x+5= .
19.因式分解3ax2-6ax= .
20.x(x+2)-x= .
21.x2-4x-ax+4a= .
22.25x2-49= .
23.36x2-60x+25= .
24.4x2+12x+9= .
25.x2-9x+18= .
26.2x2-5x-3= .
27.12x2-50x+8= .
28.因式分解(x+2)(x-3)+(x+2)(x+4)= .
29.因式分解2ax2-3x+2ax-3= .
30.因式分解9x2-66x+121= .
31.因式分解-20x2+9x+20= .
32.因式分解12x2-29x+15= .
33.因式分解36x2+39x+9= .
34.因式分解21x2-31x-22= .
35.因式分解9x4-35x2-4= .
36.因式分解(2x+1)(x+1)+(2x+1)(x-3)= .
37.因式分解2ax2-3x+2ax-3= .
38.因式分解x(y+2)-x-y-1= .
39.因式分解(x2-3x)+(x-3)2= .