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解:x(x+y)(x-y)-x(x+y)²
=x(x+y)[(x-y)-(x+y)]
=x(x+y)(x-y-x-y)
=x(x+y)×(-2y)
= -2xy(x+y)
=x(x+y)[(x-y)-(x+y)]
=x(x+y)(x-y-x-y)
=x(x+y)×(-2y)
= -2xy(x+y)
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