计算x+y+2y²/x-y,

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计算x+y+2y²/x-y,
计算x+y+2y²/x-y,

计算x+y+2y²/x-y,
原式=[(x+y)(x-y)+2y²]/(x-y)
=(x²-u²+2y²)/(x-y)
=(x²+y²)/(x-y)