求初中因式分解题目30道 二次函数题目20道, 简单就可以了。最好要过程答案。
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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.因式分解:(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.因式分解:(x-y)n-(x-y)n-2=(x-y)n-2•_________.
11.m(a-m)(a-n)-n(m-a)(a-n)=_________.
12.因式分解:x(m-n)+(n-m)y-z(m-n)=(m-n)( ).
13.因式分解:
(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=________.
52.x2+2x-3因式分解得[ ]
A.(x+1)2-4; B.x(x+2)-3;
C.(x-1)(x+3); D.(x-2)(x+2)+(2x+1).
53.a3-b3因式分解得[ ]
A.(a-b)(a2+ab+b2); B.(a+b)(a2-ab+b2);
C.(a-b)(a2-ab+b2); D.(a+b)(a2+ab+b2).
54.a2+b2+c2+2ab+2bc+2ac因式分解得[ ]
A.(a+b)2+c(c+2a+2b); B.(a+b+c)2;
C.(b+c)2+a2+2a(b+c); D.(a+b)2+(b+c)2+(c+a)2.
55.x2-2ax+a2因式分解得[ ]
A.(x-a)2 B.x(x-2a)+a2
C.(x2-a2)-2a(x-a); D.x(x-a)-a(x-a).
56.(-2)m+2(-2)m-1的值是[ ]
A.1; B.-1;
C.0; D.(-1)m+1.
57.2y(x-y)2-(y-x)3= [ ]
A.(x+y)(x-y)2; B.(3y-x)(x-y)2;
C.(x-3y)(y-x)2; D.(y-x)3.
58.-28a2b+21ab2-7ab=[ ]
A.7ab(4a-3b+1); B.7ab(-4a-3b-1);
C.-7ab(4a-3b+1); D.-7ab(4a-3b).
59.-6x2+9xy-3x= [ ]
A.3x(2x-3y+1); B.-3x(2x-3y);
C.-3x(2x+3y-1); D.-3x(2x-3y+1).
60.(x+y-z)(x-y+z)+(y-x+z)(y-x-z)= [ ]
A.2(y-z)(y-x+z); B.2x(x-y+z);
C.2y(x-y+z); D.2(x-z)(x-y+z).
61.3m(x-y)-2(y-x)2=[ ]
A.(x-y)(3m+2x-2y); B.(x-y)(3m-2x+2y);
C.(y-x)(2y-2x+3m); D.(y-x)(2x-2y+3m).
62.m(m-x)(m-y)-y(x-m)(y-m)= [ ]
A.(x-m)(m-y)(m+y); B.(m-x)(m-y)(m+y);
C.(m-x)(m-y)2; D.(x-m)(m-y)2.
63.4a(x-y)2-2b(y-x)2+(y-x)=[ ]
A.(x-y)(4ax-4ay-2bx+2by-1);
B.(x-y)(4ax-4ay+2bx-2by-1);
C.(y-x)(4ax-4ay+2bx-2by+1);
D.(y-x)(4ay-4ax-2by+2bx).
64.(x-y)(a-b)-(y-x)2+(y-x)=[ ]
A.(x-y)(x-y+a-b-1); B.(x-y)(a-b-x-y-1);
C.(x-y)(y-x+a-b-1); D.(x-y)(y-x+a-b).
65.-4a3+16a2+12a在分解因式时,应提取的公因式是[ ]
A.4a3; B.4a2;
C.-4a2; D.-4a.
66.49x3yz3+14x2y2z2-21xy2z2在分解因式时,应提取的公因式是[ ]
A.7x3yz3; B.7x2y2z2;
C.7xy2z2; D.7xyz2.
67.分解因式6a(a-b)2-8(a-b)3时,应提取的公因式是[ ]
A.a; B.6a(a-b)2;
C.8a(a-b); D.2(a-b)2.
68.观察下列代数式:
(1)2a+b和a+b; (2)5m(a-b)和-a+b;
(3)3(a+b)和-a-b; (4)x3-y3和x2-xy+y2.
其中,有公因式的只有[ ]
A.(1),(2); B.(2),(3);
C.(3),(4); D.(1),(4).
69.分解因式:(a-b)(a2-ab+b2)-ab(b-a)为[ ]
A.(a-b)(a2+b2); B.(a-b)2(a+b);
C.(a-b)3; D.(a-b)+a2+b2.
70.多项式0.5x(a-b)-0.25y(b-a)中,可提取的公因式为[ ]
A.0.5x-0.25y; B.0.5x+0.25y;
C.a-b; D.0.25(a-b).
71.在多项式9xyz-6xy2z+3xz2中,可提取的公因式为[ ]
A.xyz; B.3x;
C.3xz; D.3xy.
72.多项式-a(a-x)(x-b)+ab(a-x)(b-x)中,可提取的公因式为[ ]
A.a(a-x); B.a(x-a)(x-b);
C.(a-x)(x-b); D.-a(x-a).
73.多项式8x3y2-12x2y3-4x2y2,6m2bx2-9m2bxy-3m2bx和-10mx4y2+15mx3y3+5mx3y2的次数最高的公因式是[ ]
A.x; B.xy;
C.x(2x-3y-1); D.mx(2x-3y-1).
74.观察下列多项式:
(1)2a2b+4b2;
(2)(a+b)2x-5x2(a+b)+4(a-b)2;
(3)9a2(x-y)-4b(y-x);
(4)8a3-4a2+2a-1.
其中,可以用提公因式法分解因式的只有[ ]
A.(1),(4); B.(2),(3);
C.(2),(4); D.(1),(3).
75.(m-n)3-(2n-m)3因式分解为[ ]
A.-3n(m2+3n3-2mn); B.n(m2+2mn-3n2);
C.(2m-3n)(m2-3mn+3n2); D.(n-2m)(m2+2mn+3n2).
76.(m-n)3+(2m-3n)3因式分解为[ ]
A.(3m-4n)(3m2+7n2-9mn); B.(2m-n)(3m2+7n2+9mn);
C.(3m+4n)(3m2+7n2-9mn); D.(3m-4n)(3m2+9mn+7n2).
77.4m2-n2因式分解为[ ]
A.(2m-n)(2m+n); B.(n-2m)(n+2m);
C.(2m-n)2; D.(4m-n)(4m+n).
78.144a2-256b2因式分解为[ ]
A.(12a+16b)(12a+16b); B.(12a-16b)2;
C.(12a-26b)(12a+26b); D.16(3a-4b)(3a+4b).
79.16x16-y4z4因式分解为[ ]
A.(2x4-yz)(2x4+yz)(4x8+y2z2); B.(2x2-yz)(2x2+yz)(4x4+y2z2);
C.(4x2-yz)(4x2+yz)(4x4+y2z2); D.(4x4-yz)(4x4+yz)(x4+y2z2).
80.81x8-225a4b6因式分解为[ ]
A.(9x4-25a2b4)(9x4-25a2b2); B.(9x2-25a2b3)(9x4-25a2b3);
C.(9x2-15a2b3)(9x4+15a4b3); D.(9x4-15a2b3)(9x4+15a2b3).
81.25a2b4c16-1因式分解为[ ]
A.(5abc-1)(5abc+1); B.(6ab2c4-1)(5ab2c4+1);
C.(5ab2c8-1)(5ab2c8+1); D.(5abc4-1)(5abc4+1).
82.(a+b)2-100因式分解为[ ]
A.(a+b-10)(a-b+10); B.(a+b-10)(a+b+10);
C.(a+b-10)2; D.(a+b+10)2.
83.289-(ax-by)2因式分解为[ ]
A.(17-ax-by)(17+ax+by);
B.(17-ax-by)(17+ax-by);
C.(17-ax+by)(17+ax+by);
D.(17-ax+by)(17+ax-by).
84.361-(3a+2b)2因式分解为[ ]
A.(19-3a-2b)(19+3a+2b);
B.(19-3a+2b)(19+3a-2b);
C.(19+3a-2b)(19-3a+2b);
D.(3a+2b-19)(3a-2b+19).
[ ]
86.(a-b)4-81b4因式分解为[ ]
A.(a-4b)(a+2b)(a2-2ab+10b2);
B.(a-4b)(a+2b)(a-5b)(a+3b);
C.(a2-2ab-8b2)(a2-2ab+10b2);
D.(a2-2ab+8b2)(a2-2ab+10b2).
87.(a+b)2-4(a-b)2因式分解为[ ]
A.(a+b-2a-2b)(a+b+2a-b);
B.(5a-3b)(5b-3a);
C.(3a-b)(3b-a);
D.(3a-b)(2b-a);.
88.b2-(a-b+c)2因式分解为[ ]
A.(b+a+b+c)(b-a+b-c);
B.(b+a-b+c)(2b+a+c);
C.(a+c)(2b-a+c);
D.(a+c)(2b-a-c).
[ ]
90.64a8-b2因式分解为[ ]
A.(64a4-b)(a4+b); B.(16a2-b)(4a2+b);
C.(8a4-b)(8a4+b); D.(8a2-b)(8a4+b).
91.(a+2b)2-(x-3y)2因式分解为[ ]
A.(a+2b+x-3y)(a+2b-x-3y);
B.(a+2b+x+3y)(a+2b-x-3y);
C.(a+2b+x-3y)(a+2b-x+3y);
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.因式分解:(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.因式分解:(x-y)n-(x-y)n-2=(x-y)n-2•_________.
11.m(a-m)(a-n)-n(m-a)(a-n)=_________.
12.因式分解:x(m-n)+(n-m)y-z(m-n)=(m-n)( ).
13.因式分解:
(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=________.
52.x2+2x-3因式分解得[ ]
A.(x+1)2-4; B.x(x+2)-3;
C.(x-1)(x+3); D.(x-2)(x+2)+(2x+1).
53.a3-b3因式分解得[ ]
A.(a-b)(a2+ab+b2); B.(a+b)(a2-ab+b2);
C.(a-b)(a2-ab+b2); D.(a+b)(a2+ab+b2).
54.a2+b2+c2+2ab+2bc+2ac因式分解得[ ]
A.(a+b)2+c(c+2a+2b); B.(a+b+c)2;
C.(b+c)2+a2+2a(b+c); D.(a+b)2+(b+c)2+(c+a)2.
55.x2-2ax+a2因式分解得[ ]
A.(x-a)2 B.x(x-2a)+a2
C.(x2-a2)-2a(x-a); D.x(x-a)-a(x-a).
56.(-2)m+2(-2)m-1的值是[ ]
A.1; B.-1;
C.0; D.(-1)m+1.
57.2y(x-y)2-(y-x)3= [ ]
A.(x+y)(x-y)2; B.(3y-x)(x-y)2;
C.(x-3y)(y-x)2; D.(y-x)3.
58.-28a2b+21ab2-7ab=[ ]
A.7ab(4a-3b+1); B.7ab(-4a-3b-1);
C.-7ab(4a-3b+1); D.-7ab(4a-3b).
59.-6x2+9xy-3x= [ ]
A.3x(2x-3y+1); B.-3x(2x-3y);
C.-3x(2x+3y-1); D.-3x(2x-3y+1).
60.(x+y-z)(x-y+z)+(y-x+z)(y-x-z)= [ ]
A.2(y-z)(y-x+z); B.2x(x-y+z);
C.2y(x-y+z); D.2(x-z)(x-y+z).
61.3m(x-y)-2(y-x)2=[ ]
A.(x-y)(3m+2x-2y); B.(x-y)(3m-2x+2y);
C.(y-x)(2y-2x+3m); D.(y-x)(2x-2y+3m).
62.m(m-x)(m-y)-y(x-m)(y-m)= [ ]
A.(x-m)(m-y)(m+y); B.(m-x)(m-y)(m+y);
C.(m-x)(m-y)2; D.(x-m)(m-y)2.
63.4a(x-y)2-2b(y-x)2+(y-x)=[ ]
A.(x-y)(4ax-4ay-2bx+2by-1);
B.(x-y)(4ax-4ay+2bx-2by-1);
C.(y-x)(4ax-4ay+2bx-2by+1);
D.(y-x)(4ay-4ax-2by+2bx).
64.(x-y)(a-b)-(y-x)2+(y-x)=[ ]
A.(x-y)(x-y+a-b-1); B.(x-y)(a-b-x-y-1);
C.(x-y)(y-x+a-b-1); D.(x-y)(y-x+a-b).
65.-4a3+16a2+12a在分解因式时,应提取的公因式是[ ]
A.4a3; B.4a2;
C.-4a2; D.-4a.
66.49x3yz3+14x2y2z2-21xy2z2在分解因式时,应提取的公因式是[ ]
A.7x3yz3; B.7x2y2z2;
C.7xy2z2; D.7xyz2.
67.分解因式6a(a-b)2-8(a-b)3时,应提取的公因式是[ ]
A.a; B.6a(a-b)2;
C.8a(a-b); D.2(a-b)2.
68.观察下列代数式:
(1)2a+b和a+b; (2)5m(a-b)和-a+b;
(3)3(a+b)和-a-b; (4)x3-y3和x2-xy+y2.
其中,有公因式的只有[ ]
A.(1),(2); B.(2),(3);
C.(3),(4); D.(1),(4).
69.分解因式:(a-b)(a2-ab+b2)-ab(b-a)为[ ]
A.(a-b)(a2+b2); B.(a-b)2(a+b);
C.(a-b)3; D.(a-b)+a2+b2.
70.多项式0.5x(a-b)-0.25y(b-a)中,可提取的公因式为[ ]
A.0.5x-0.25y; B.0.5x+0.25y;
C.a-b; D.0.25(a-b).
71.在多项式9xyz-6xy2z+3xz2中,可提取的公因式为[ ]
A.xyz; B.3x;
C.3xz; D.3xy.
72.多项式-a(a-x)(x-b)+ab(a-x)(b-x)中,可提取的公因式为[ ]
A.a(a-x); B.a(x-a)(x-b);
C.(a-x)(x-b); D.-a(x-a).
73.多项式8x3y2-12x2y3-4x2y2,6m2bx2-9m2bxy-3m2bx和-10mx4y2+15mx3y3+5mx3y2的次数最高的公因式是[ ]
A.x; B.xy;
C.x(2x-3y-1); D.mx(2x-3y-1).
74.观察下列多项式:
(1)2a2b+4b2;
(2)(a+b)2x-5x2(a+b)+4(a-b)2;
(3)9a2(x-y)-4b(y-x);
(4)8a3-4a2+2a-1.
其中,可以用提公因式法分解因式的只有[ ]
A.(1),(4); B.(2),(3);
C.(2),(4); D.(1),(3).
75.(m-n)3-(2n-m)3因式分解为[ ]
A.-3n(m2+3n3-2mn); B.n(m2+2mn-3n2);
C.(2m-3n)(m2-3mn+3n2); D.(n-2m)(m2+2mn+3n2).
76.(m-n)3+(2m-3n)3因式分解为[ ]
A.(3m-4n)(3m2+7n2-9mn); B.(2m-n)(3m2+7n2+9mn);
C.(3m+4n)(3m2+7n2-9mn); D.(3m-4n)(3m2+9mn+7n2).
77.4m2-n2因式分解为[ ]
A.(2m-n)(2m+n); B.(n-2m)(n+2m);
C.(2m-n)2; D.(4m-n)(4m+n).
78.144a2-256b2因式分解为[ ]
A.(12a+16b)(12a+16b); B.(12a-16b)2;
C.(12a-26b)(12a+26b); D.16(3a-4b)(3a+4b).
79.16x16-y4z4因式分解为[ ]
A.(2x4-yz)(2x4+yz)(4x8+y2z2); B.(2x2-yz)(2x2+yz)(4x4+y2z2);
C.(4x2-yz)(4x2+yz)(4x4+y2z2); D.(4x4-yz)(4x4+yz)(x4+y2z2).
80.81x8-225a4b6因式分解为[ ]
A.(9x4-25a2b4)(9x4-25a2b2); B.(9x2-25a2b3)(9x4-25a2b3);
C.(9x2-15a2b3)(9x4+15a4b3); D.(9x4-15a2b3)(9x4+15a2b3).
81.25a2b4c16-1因式分解为[ ]
A.(5abc-1)(5abc+1); B.(6ab2c4-1)(5ab2c4+1);
C.(5ab2c8-1)(5ab2c8+1); D.(5abc4-1)(5abc4+1).
82.(a+b)2-100因式分解为[ ]
A.(a+b-10)(a-b+10); B.(a+b-10)(a+b+10);
C.(a+b-10)2; D.(a+b+10)2.
83.289-(ax-by)2因式分解为[ ]
A.(17-ax-by)(17+ax+by);
B.(17-ax-by)(17+ax-by);
C.(17-ax+by)(17+ax+by);
D.(17-ax+by)(17+ax-by).
84.361-(3a+2b)2因式分解为[ ]
A.(19-3a-2b)(19+3a+2b);
B.(19-3a+2b)(19+3a-2b);
C.(19+3a-2b)(19-3a+2b);
D.(3a+2b-19)(3a-2b+19).
[ ]
86.(a-b)4-81b4因式分解为[ ]
A.(a-4b)(a+2b)(a2-2ab+10b2);
B.(a-4b)(a+2b)(a-5b)(a+3b);
C.(a2-2ab-8b2)(a2-2ab+10b2);
D.(a2-2ab+8b2)(a2-2ab+10b2).
87.(a+b)2-4(a-b)2因式分解为[ ]
A.(a+b-2a-2b)(a+b+2a-b);
B.(5a-3b)(5b-3a);
C.(3a-b)(3b-a);
D.(3a-b)(2b-a);.
88.b2-(a-b+c)2因式分解为[ ]
A.(b+a+b+c)(b-a+b-c);
B.(b+a-b+c)(2b+a+c);
C.(a+c)(2b-a+c);
D.(a+c)(2b-a-c).
[ ]
90.64a8-b2因式分解为[ ]
A.(64a4-b)(a4+b); B.(16a2-b)(4a2+b);
C.(8a4-b)(8a4+b); D.(8a2-b)(8a4+b).
91.(a+2b)2-(x-3y)2因式分解为[ ]
A.(a+2b+x-3y)(a+2b-x-3y);
B.(a+2b+x+3y)(a+2b-x-3y);
C.(a+2b+x-3y)(a+2b-x+3y);
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2.4m的平方+8m+43.(x的平方+4)的平方+8x(x的平方+4)+16x的平方)4.已知(a+2b)的平方-2a-4b+1=0,求(a+b)的2006次方5.9a的平方-4b的平方+4bc-c的平方6.8a的三次方b的三次方c的三次方-1 因式分解3a3b2c-6a2b2c2+9ab2c3=3ab^2 c(a^2-2ac+3c^2) 3.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-1) 41.因式分解2ax2-3x+2ax-3= (x+1)(2ax-3) 42.因式分解9x2-66x+121=(3x-11)^2 43.因式分解8-2x2=2(2+x)(2-x) 44.因式分解x2-x+14 =整数内无法分解 45.因式分解9x2-30x+25=(3x-5)^2 46.因式分解-20x2+9x+20=(-4x+5)(5x+4) 47.因式分解12x2-29x+15=(4x-3)(3x-5) 48.因式分解36x2+39x+9=3(3x+1)(4x+3) 49.因式分解21x2-31x-22=(21x+11)(x-2) 50.因式分解9x4-35x2-4=(9x^2+1)(x+2)(x-2) 51.因式分解(2x+1)(x+1)+(2x+1)(x-3)=2(x-1)(2x+1) 52.因式分解2ax2-3x+2ax-3=(x+1)(2ax-3) 53.因式分解x(y+2)-x-y-1=(x-1)(y+1) 54.因式分解(x2-3x)+(x-3)2=(x-3)(2x-3) 55.因式分解9x2-66x+121=(3x-11)^2 56.因式分解8-2x2=2(2-x)(2+x) 57.因式分解x4-1=(x-1)(x+1)(x^2+1) 58.因式分解x2+4x-xy-2y+4=(x+2)(x-y+2) 59.因式分解4x2-12x+5=(2x-1)(2x-5) 60.因式分解21x2-31x-22=(21x+11)(x-2) 61.因式分解4x2+4xy+y2-4x-2y-3=(2x+y-3)(2x+y+1) 62.因式分解9x5-35x3-4x=x(9x^2+1)(x+2)(x-2) 63.因式分解下列各式: (1)3x2-6x=3x(x-2) (2)49x2-25=(7x+5)(7x-5) (3)6x2-13x+5=(2x-1)(3x-5) (4)x2+2-3x=(x-1)(x-2) (5)12x2-23x-24=(3x-8)(4x+3) (6)(x+6)(x-6)-(x-6)=(x-6)(x+5) (7)3(x+2)(x-5)-(x+2)(x-3)=2(x-6)(x+2) (8)9x2+42x+49=(3x+7)^2
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