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部分预览 《2 提公因式法》习题
1.多项式8x3y2-12xy3z的公因式是_________.
2.多项式-6ab2+18a2b2-12a3b2c的公因式是( )
A.-6ab2c B.-ab2 C.-6ab2 D.-6a3b2c
3.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-20a2b2 B.30a2b3-15ab4-10a3b2
C.10a2b-20a2b3+50a4b D.5a2b4-10a3b3+15a4b2
5.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.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)
7.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)
8.多项式-2an-1-4an+1的公因式是M,则M等于( )
A.2an-1 B.-2an C.-2an-1 D.-2an+1
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