计算题:x²/x+y -x+y

问题描述:

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)