计算x/x+y·x²+2xy+y²/x²

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计算x/x+y·x²+2xy+y²/x²计算x/x+y·x²+2xy+y²/x²计算x/x+y·x²+2xy+y²/x&

计算x/x+y·x²+2xy+y²/x²
计算x/x+y·x²+2xy+y²/x²

计算x/x+y·x²+2xy+y²/x²
原式=x/(x+y)*(x+y)²/x²
=(x+y)/x