(x-y+4xy除以x-y)(x+y-4xy除以x+y)的解

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(x-y+4xy除以x-y)(x+y-4xy除以x+y)的解

原式=[(x-y)²+4xy]/(x-y)乘[(x+y)²-4xy]/(x+y)
=(x+y)²/(x-y)乘(x-y)²/(x+y)
=(x+y)(x-y)
=x²-y²