计算 1/x²-y²+ 2 /（x-y）²
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计算1/x²-y²+2/（x-y）²计算1/x²-y²+2/（x-y）²计算1/x²-y²+2/（x-y）²1
计算 1/x²-y²+ 2 /（x-y）²
计算 1/x²-y²+ 2 /（x-y）²
计算 1/x²-y²+ 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+2x+2y)/[(x+y)(x-y)²]
=(3x+y)/[(x+y)(x-y)²]