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计算：1/x^2-y^2+2/(x-y)^2

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计算：1/x^2-y^2+2/(x-y)^2
计算：1/x^2-y^2+2/(x-y)^2
1/(x²-y²)+2/(x-y)²
=1/[(x+y)(x-y)]+2/(x-y)²
=(x-y)/[(x+y)(x-y)²]+[2(x+y)]/[(x+y)(x-y)²]
=[(x-y)+2(x+y)]/[(x+y)(x-y)²]
=(3x+y)/[(x+y)(x-y)²]
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