计算：[(x-y)^2-(x+y)^2]/(-4xy)=

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计算：[(x-y)^2-(x+y)^2]/(-4xy)=
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计算：[(x-y)^2-(x+y)^2]/(-4xy)=
计算：[(x-y)^2-(x+y)^2]/(-4xy)=

计算：[(x-y)^2-(x+y)^2]/(-4xy)=
[(x-y)^2-(x+y)^2]/(-4xy)
=(x-y+x+y)(x-y-x-y)/(-4xy)
=2x*(-2y)/(-4xy)
=-4xy/(-4xy)
=1

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