《提公因式法》习题1.doc

--6ab2+18a2b2-12a3b2c的公因式是()A.-6ab2cB.-ab2C.-6ab2D.-().-9a2b2=3abc(4-3ab)-3xy+6y=3y(x2-x+2y)C.-a2+ab-ac=-a(a-b+c)+5xy-y=y(x2+5x)().--15ab4--20a2b3+-10a3b3+().A.-2ab2+4a2b=2ab(-b+2a)(a-b)-9n(b-a)=3(a-b)(m+3n)C.-5ab+15a2bx+25ab3y=-5ab(-3ax-5b2y);-6ay-3a=3a(y2-2y-1):(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×-31×=:(1)8ab2-16a3b3;(2)-15xy-5x2;(3)a3b3+a2b2-ab;(4)-3a3m-6a2m+:-(a-b)mn-a+(n-2)-m2(2-n)因式分解等于().A.(n-2)(m+m2)B.(n-2)(m-m2)(n-2)(m+1)(n-2)(m-1)(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):(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).-2an-1-4an+1的公因式是M,则M等于().-1B.-2anC.-2an-1D.-2an+:39×37-13×34=:x(6m-nx)-