【x平方除以(x+y)】-x+y=

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【x平方除以(x+y)】-x+y=【x平方除以(x+y)】-x+y=【x平方除以(x+y)】-x+y=x²/(x+y)-x+y=x²/(x+y)-(x²-y²)

【x平方除以(x+y)】-x+y=
【x平方除以(x+y)】-x+y=

【x平方除以(x+y)】-x+y=
x²/(x+y)-x+y
=x²/(x+y)-(x²-y²)/(x+y)
=[x²-(x²-y²)]/(x+y)
=y²/(x+y)

x²/(x+y)-x+y
=x²/(x+y)-(x-y)
=x²/(x+y)-(x+y)(x-y)/(x+y)
=[x²-(x²-y²)]/(x+y)
=y²/(x+y)
望采纳

=x²/(x+y)-(x-y)
=x²/(x+y)-(x+y)(x-y)/(x+y)
=[x²-(x²-y²)]/(x+y)
=y²/(x+y)
望采纳