y/x²-xy+x/y²-xy 分式的加减,

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y/x²-xy+x/y²-xy 分式的加减,

y/x²-xy+x/y²-xy 分式的加减,
y/x²-xy+x/y²-xy 分式的加减,

y/x²-xy+x/y²-xy 分式的加减,
=y/x(x-y)-x/y(x-y)
=(y²-x²)/xy(x-y)
=-(x+y)(x-y)/xy(x-y)
=-(x+y)/xy

是y/(x²-xy)+x/(y²-xy)吗?
若是则=y²/xy(x-y)-x²/xy(x-y)
=(y²-x²)/xy(x-y)
=-(y+x)/xy

y/x²-xy+x/y²-xy
解=y/x²+x/y²-2xy
=x²y²+x²y²/x²y²-2xy
=2x²y²/x²y²-2xy
=2-2xy
=2(1-xy)