因式分解(x-y)²-4(x+y)²=
问题描述:
因式分解(x-y)²-4(x+y)²=
答
=(X+Y)(X-Y)-4(X+Y)(X+Y)=(X+Y)(X-Y-4X-4Y)=(X+Y)(-3X-5Y)=-(X+Y)(3X+5Y)
答
(x-y)²-4(x+y)²
=【(x-y)+2(x+y)】【(x-y)-2(x+y)】
=(3x+y)(-x-3y)
=-(3x+y)(x+3y)
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答
很高兴为你解答,答案如下:
(x-y)²-4(x+y)²=(x-y)²-[2(x+y)]²=[(x-y)-2(x+y)][(x-y)+2(x+y)]=(x-y-2x-2y)(x-y+2x+2y)=-(3x+y)(x+3y)