下列因式分解变形中,正确的是(    ) A、ab(a-b)-a(b-a)=-a(b-a)(b+1);

下列因式分解变形中,正确的是(   

Aab(a-b)-a(b-a)-a(b-a)(b+1);   B6(m+n)2-2(m+n)(2m+n)(3m+n+1)

C3(y-x)2+2(x-y)(y-x)(3y-3x+2);   D3x(x+y)2-(x+y)(x+y)2(2x+y)

答案

A

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