一、计算1.a2·(-a)5·(-3a)32.[(am)n]p3.(-mn)2(-m2n)34.(-a2b)3·(-ab2)5.(-3ab)·(-a2c)·6ab26.(-ab)3·(-a2b)·(-a2b4c)27.(3m-n)(m-2n).8.(x+2y)(5a+3b).9.5x(x2+2x+1)-(2x+3)(x-5)10.(-2x-5)(2x-5)11.-(2x2+3y)(3y-2x2)12.(a-5)2-(a+6)(a-6)13.(2x-3y)(3y+2x)-(4y-3x)(3x+4y)14.3(2x+1)(2x-1)-2(3x+2)(2-3x)15.(31x+y)(31x-y)(91x2+y2)16.)1)(1)(1)(1(42xxxx二、基础训练1.多项式8x3y2-12xy3z的公因式是_________.2.多项式-6ab2+18a2b2-12a3b2c的公因式是()A.-6ab2cB.-ab2C.-6ab2D.-6a3b2c3.下列用提公因式法因式分解正确的是()A.12abc-9a2b2=3abc(4-3ab)B.3x2y-3xy+6y=3y(x2-x+2y)C.-a2+ab-ac=-a(a-b+c)D.x2y+5xy-y=y(x2+5x)4.下列多项式应提取公因式5a2b的是()A.15a2b-20a2b2B.30a2b3-15ab4-10a3b2C.10a2b-20a2b3+50a4bD.5a2b4-10a3b3+15a4b25.下列因式分解不正确的是()A.-2ab2+4a2b=2ab(-b+2a)B.3m(a-b)-9n(b-a)=3(a-b)(m+3n)C.-5ab+15a2bx+25ab3y=-5ab(-3ax-5b2y);D.3ay2-6ay-3a=3a(y2-2y-1)6.填空题:(1)ma+mb+mc=m(________);(2)多项式32p2q3-8pq4m的公因式是_________;(3)3a2-6ab+a=_________(3a-6b+1);(4)因式分解:km+kn=_________;(5)-15a2+5a=________(3a-1);(6)计算:21×3.14-31×3.14=_________.7.用提取公因式法分解因式:(1)8ab2-16a3b3;(2)-15xy-5x2;(3)a3b3+a2b2-ab;(4)-3a3m-6a2m+12am.8.因式分解:-(a-b)mn-a+b.三、提高训练9.多项式m(n-2)-m2(2-n)因式分解等于()A.(n-2)(m+m2)B.(n-2)(m-m2)C.m(n-2)(m+1)D.m(n-2)(m-1)10.将多项式a(x-y)+2by-2bx分解因式,正确的结果是()A.(x-y)(-a+2b)B.(x-y)(a+2b)C.(x-y)(a-2b)D.-(x-y)(a+2b)11.把下列各式分解因式:(1)(a+b)-(a+b)2;(2)x(x-y)+y(y-x);(3)6(m+n)2-2(m+n);(4)m(m-n)2-n(n-m)2;(5)6p(p+q)-4q(q+p).应用拓展12.多项式-2an-1-4an+1的公因式是M,则M等于()A.2an-1B.-2anC.-2an-1D.-2an+113.用简便方法计算:39×37-13×34=_______.14.因式分解:x(6m-nx)-nx2.17.18.(x+4)(x+7)19.(x-3)(x+5)20.(2x+3)(3x-2)