精编WORD文档下载可编缉打印下载文档,远离加班熬夜因式分解练习题及答案篇一:因式分解练习题因式分解练习题一、填空题:2.(a-3)(3-2a)=_______(3-a)(3-2a);12.若m2-3m+2=(m+a)(m+b),则a=______,b=______;15.当m=______时,x2+2(m-3)x+25是完全平方式.二、选择题:1.下列各式的因式分解结果中,正确的是A.a2b+7ab-b=b(a2+7a)B.3x2y-3xy-6y=3y(x-2)(x+1)][C.8xyz-6x2y2=2xyz(4-3xy)D.-2a2+4ab-6ac=-2a(a+2b-3c)2.多项式m(n-2)-m2(2-n)分解因式等于A.(n-2)(m+m2)B.(n-2)(m-m2)C.m(n-2)(m+1)D.m(n-2)(m-1)3.在下列等式中,属于因式分解的是A.a(x-y)+b(m+n)=ax+bm-ay+bnB.a2-2ab+b2+1=(a-b)2+1C.-4a2+9b2=(-2a+3b)(2a+3b)D.x2-7x-8=x(x-7)-84.下列各式中,能用平方差公式分解因式的是精编WORD文档下载可编缉打印下载文档,远离加班熬夜A.a2+b2B.-a2+b2C.-a2-b2D.-(-a2)+b25.若9x2+mxy+16y2是一个完全平方式,那么m的值是A.-12B.±24C.12D.±126.把多项式an+4-an+1分解得A.an(a4-a)B.an-1(a3-1)C.an+1(a-1)(a2-a+1)D.an+1(a-1)(a2+a+1)7.若a2+a=-1,则a4+2a3-3a2-4a+3的值为[][][][][]A.8B.7C.10D.128.已知x2+y2+2x-6y+10=0,那么x,y的值分别为A.x=1,y=3B.x=1,y=-3C.x=-1,y=3D.x=1,y=-39.把(m2+3m)4-8(m2+3m)2+16分解因式得A.(m+1)4(m+2)2B.(m-1)2(m-2)2(m2+3m-2)C.(m+4)2(m-1)2D.(m+1)2(m+2)2(m2+3m-2)210.把x2-7x-60分解因式,得A.(x-10)(x+6)B.(x+5)(x-12)C.(x+3)(x-20)D.(x-5)(x+12)11.把3x2-2xy-8y2分解因式,得A.(3x+4)(x-2)B.(3x-4)(x+2)C.(3x+4y)(x-2y)精编WORD文档下载可编缉打印下载文档,远离加班熬夜D.(3x-4y)(x+2y)12.把a2+8ab-33b2分解因式,得A.(a+11)(a-3)B.(a-11b)(a-3b)C.(a+11b)(a-3b)D.(a-11b)(a+3b)13.把x4-3x2+2分解因式,得[][][][][][][]A.(x2-2)(x2-1)B.(x2-2)(x+1)(x-1)C.(x2+2)(x2+1)D.(x2+2)(x+1)(x-1)14.多项式x2-ax-bx+ab可分解因式为[]A.-(x+a)(x+b)B.(x-a)(x+b)C.(x-a)(x-b)D.(x+a)(x+b)15.一个关于x的二次三项式,其x2项的系数是1,常数项是-12,且能分解因式,这样的二次三项式是[]A.x2-11x-12或x2+11x-12B.x2-x-12或x2+x-12C.x2-4x-12或x2+4x-12D.以上都可以16.下列各式x3-x2-x+1,x2+y-xy-x,x2-2x-y2+精编WORD文档下载可编缉打印下载文档,远离加班熬夜1,(x2+3x)2-(2x+1)2中,不含有(x-1)因式的有[]A.1个B.2个C.3个D.4个17.把9-x2+12xy-36y2分解因式为[]A.(x-6y+3)(x-6x-3)B.-(x-6y+3)(x-6y-3)C.-(x-6y+3)(x+6y-3)D.-(x-6y+3)(x-6y+3)18.下列因式分解错误的是[]A.a2-bc+ac-ab=(a-b)(a+c)B.ab-5a+3b-15=(b-5)(a+3)C.x2+3xy-2x-6y=(x+3y)(x-2)D.x2-6xy-1+9y2=(x+3y+1)(x+3y-1)19.已知a2x2±2x+b2是完全平方式,且a,b都不为零,则a与b的关系为A.互为倒数或互为负倒数B.互为相反数C.相等的数D.任意有理数20.对x4+4进行因式分解,所得的正确结论是A.不能分解因式B.有因式x2+2x+2C.(xy+2)(xy-8)D.(xy-2)(xy-8)21.把a4+2a2b2+b4-a2b2分解因式为A.(a2+b2+ab)2B.(a2+b2+ab)(a2+b2-ab)C.(a2-b2+ab)(a2-b2-ab)D.(a2+b2-ab)222.-(3x-1)(x精编WORD文档下载可编缉打印下载文档,远离加班熬夜+2y)是下列哪个多项式的分解结果A.3x2+6xy-x-2yB.3x2-6xy+x-2yC.x+2y+3x2+6xyD.x+2y-3x2-6xy23.64a8-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)24.9(x-y)2+12(x2-y2)+4(x+y)2因式分解为[][][][][]篇二:因式分解练习题加答案200道因式分解3a3b2c-6a2b2c2+9ab2c3=3ab^2c(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)^25.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)^28.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)精编WORD文档下载可编缉打印下载文档,远离加班熬夜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)^212.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)^237.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)精编WORD文档下载可编缉打印下载文档,远离加班熬夜(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)^243.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)^246.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)^256.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)精编WORD文档下载可编缉打印下载文档,远离加班熬夜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。1.若(2x)n?81=(4x2+9)(2x+3)(2x?3),那么n的值是(A.2B.4C.6D.82.若9x2?12xy+m是两数和的平方式,那么m的值是(A.2y2B.4y2C.±4y2D.±16y23.把多项式a4?2a2b2+b4因式分解的结果为()A.a2(a2?2b2)+b4B.(a2?b2)2C.(a?b)4D.(a+b)2(a?b)24.把(a+b)2?4(a2?b2)+4(a?b)2分解因式为()A.(3a?b)2B.(3b+a)2C.(3b?a)2D.(3a+b)25.计算:(?)2001+(?)2000的结果为()精编WORD文档下载可编缉打印下载文档,远离加班熬夜A.(?)2003B.?(?)2001C.D.?))6.已知x,y为任意有理数,记M=x2+y2,N=2xy,则M与N的大小关系为()A.M>NB.M≥NC.M≤ND.不能确定7.对于任何整数m,多项式(4m+5)2?9都能()A.被8整除B.被m整除C.被(m?1)整除D.被(2n?1)整除8.将?3x2n?6xn分解因式,结果是()A.?3xn(xn+2)B.?3(x2n+2xn)C.?3xn(x2+2)D.3(?x2n?2xn)9.下列变形中,是正确的因式分解的是()A.0.09m2?n2=(0.03m+)(0.03m?)B.x2?10=x2?9?1=(x+3)(x?3)?1C.x4?x2=(x2+x)(x2?x)D.(x+a)2?(x?a)2=4ax10.多项式(x+y?z)(x?y+z)?(y+z?x)(z?x?y)的公因式是(A.x+y?zB.x?y+zC.y+z?xD.不存在11.已知x为任意有理数,则多项式x?1?x2的值()A.一定为负数B.不可能为正数精编WORD文档下载可编缉打印下载文档,远离加班熬夜C.一定为正数D.可能为正数或负数或零二、解答题:分解因式:)(1)(ab+b)2?(a+b)2(2)(a2?x2)2?4ax(x?a)2(3)7