七年级数学求解,必采纳,急急急急急
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x/(x-y)*y²/(x+y)-x^4*y/(x²-y²)/[x²/(x²+y²)]
=xy²/(x²-y²)-x²y/(x²-y²)
=xy(y-x)/(x²-y²)
=-xy/(x+y)
=xy²/(x²-y²)-x²y/(x²-y²)
=xy(y-x)/(x²-y²)
=-xy/(x+y)
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