因式分【解析】
km+kn=_________;
3a2-6ab+a=_________(3a-6b+1);
多项式32p2q3-8pq4m的公因式是_________;
ma+mb+mc=m(________);
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) |
下列多项式应提取公因式5a2b的是( )
A.15a2b-20a2b2 |
B.30a2b3-15ab4-10a3b2 |
C.10a2b-20a2b3+50a4b |
D.5a2b4-10a3b3+15a4b2 |