=(x+y)²(x-y)²/x²y²×1/(x+y)²×x³/(x-y)³
=x/y²(x-y)
当x=3,y=2时 原式=3/2²(3-2)=3/4
化简（x²-y²/xy)²÷（x+y)²×（x/x-y)³求当x=3
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