作业帮计算：（x-y+4xy/x-y)(x+y-4xy/x+y)
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计算：（x-y+4xy/x-y)(x+y-4xy/x+y)
计算：（x-y+4xy/x-y)(x+y-4xy/x+y)
计算：（x-y+4xy/x-y)(x+y-4xy/x+y)
：原式=[（x^2-2XY+Y^2+4xy)/x-y][(x^2+2XY+y^2-4xy)/x+y]
=[(x+y)^2/(x-y)][(x-y)^2/(x+y)]
=X^2-Y^2