文档介绍：1.、计算a2•(-a)5•(-3a)37.(3m-n)(m-2n).2.[(am)n]p2 2 33.(-mn)(-mn)8.(x+2y)(5a+3b)(x2+2x+1)-(2x+3)(x-5)4.(-a2b)3•(-ab2)10.(-2x-5)(2x-5)225.(-3ab)•(-a2c)•6ab22211.-(2x2+3y)(3y-2x2)6.(-ab)3•(-a2b)•(-a2b4c)212.(a-5)2-(a+6)(a-6)()222A.-6abcB.-abC.-6ab13. (2x—3y)(3y+2x)—(4y—3x)(3x+4y)D.-6a3b2c下列用提公因式法因式分解正确的是()A. 12abc-9a2b2=3abc(4-3ab)2 -3xy+6y=3y(x-x+2y)2C.-a+ab-ac=-a(a-b+c)+5xy-y=y(x2+5x)下列多项式应提取公因式5a2b的是()A . 15a2b--15ab4-10a3b22 2 3 4C . 10ab-20ab+-10a3b3+15a4b2下列因式分解不正确的是( )(2x+1)(2x—1)—2(3x+2)(2—3x)A. -2ab2+4a2b=2ab (-b+2a)(a-b)-9n(b-a)=3(a-b)(m+3r)2 3C . -5ab+15abx+25aby=-5ab2 2 2(-3ax-5by);-6ay-3a=3a(y-2y-1)填空题:(1)ma+mb+mc=m ); (2)多项式32p2q3-8pq4m的公因式是 ;23a-6ab+a= (3a-6b+1);因式分解:km+kn= ;-15a2+5a= (3a-1); (6)计算:-= .用提取公因式法分解因式:2 3 315.(沖)(診—y)—)(1)8ab-16ab; (2)-15xy-5x2;(3)a3b3+a2b2-ab; (4)-3a3m-6a2m+12am16. (1 x)(1 x)(1x2)(1x4)二、-12xy3z的公因式是多项式-6ab2+18aV-12a3b2c的公因式是因式分解:-(a-b)mn-a+b