分式x²-y²/xy-xy-y²/xy-x²可化简为()

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分式x²-y²/xy-xy-y²/xy-x²可化简为()

分式x²-y²/xy-xy-y²/xy-x²可化简为()
分式x²-y²/xy-xy-y²/xy-x²可化简为()

分式x²-y²/xy-xy-y²/xy-x²可化简为()
原式=(x²-y²)/xy-y(x-y)/[-x(x-y)]
=(x²-y²)/xy+y/x
=(x²-y²+y²)/xy
=x²/xy
=x/y

我以为是有三个式子。。