计算题:x²/x+y -x+y
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计算题:x²/x+y -x+y
计算题:x²/x+y -x+y
计算题:x²/x+y -x+y
x²/(x+y )-x+y
=x²/(x+y )-(x-y)
=x²/(x+y )-(x²-y²)/(x+y)
=(x²-x²+y²)/(x+y)
=y²/(x+y)
原式=x^2/(x+y)-x+y=(x^2-x^2-xy+xy+y^2)/(x+y)=y^2/(x+y)
是不是漏了个括号?
如果不是的结果是2y
=x²/(x+y )-(x-y)
=x²/(x+y )-(x²-y²)/(x+y)
=(x²-x²+y²)/(x+y)
=y²/(x+y)