画圈的这5道因式分解求过程和答案.....谢谢
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(a-b)^2+4ab=a^2-2ab+b^2+4ab=a^2+2ab+b^2=(a+b)^2
(p-4)(p+1)+3p=p^2-3p-4+3p=p^2-4=(p-2)(p+2)
4xy^2-4x^2y-y^3=-y(4x^2-4xy+y^2)=-y(2x-y)^2
3ax^2-3ay^2=3a(x^2-y^2)=3a(x-y)(x+y)
(2x+y)^2-(x+2y)^2=(2x+y-x-2y)(2x+y+x+2y)=(x-y)(3x+3y)=3(x-y)(x+y)
(p-4)(p+1)+3p=p^2-3p-4+3p=p^2-4=(p-2)(p+2)
4xy^2-4x^2y-y^3=-y(4x^2-4xy+y^2)=-y(2x-y)^2
3ax^2-3ay^2=3a(x^2-y^2)=3a(x-y)(x+y)
(2x+y)^2-(x+2y)^2=(2x+y-x-2y)(2x+y+x+2y)=(x-y)(3x+3y)=3(x-y)(x+y)
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