(x-y)²-﹙x+y﹚²因式分解

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(x-y)²-﹙x+y﹚²因式分解
(x-y)²-﹙x+y﹚²因式分解

(x-y)²-﹙x+y﹚²因式分解
(x-y)²-﹙x+y﹚²
=[(x-y)-(x+y)][(x-y)+(x+y)]
=(x-y-x-y)(x-y+x+y)
=-2y*2x
=-4xy

(x-y)²-﹙x+y﹚²
=x²-2xy+y²-(x²+2xy+y²)
=x²-2xy+y²-x²-2xy-y²
=-4xy