因式分解(x-y)²-y(y-x)² ,

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因式分解(x-y)²-y(y-x)² ,

因式分解(x-y)²-y(y-x)² ,
因式分解(x-y)²-y(y-x)² ,

因式分解(x-y)²-y(y-x)² ,

=y[(x-y)²-1]
=y[(x-y)²+1][(x-y)²-1]