作业帮先化简,再求值 (x²-y²/xy)²÷（x+y）²*(x/x-y)²,其中x=3,y=2
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先化简,再求值 (x²-y²/xy)²÷（x+y）²*(x/x-y)²,其中x=3,y=2
先化简,再求值 (x²-y²/xy)²÷（x+y）²*(x/x-y)²,其中x=3,y=2
先化简,再求值 (x²-y²/xy)²÷（x+y）²*(x/x-y)²,其中x=3,y=2
x=3,y=2
(x²-y²/xy)²÷（x+y）²*(x/(x-y)²
= (x+y)(x-y)/(xy)² *1/(x+y）² * x²/(x-y)²
= y² /{(x+y)(x-y)}
= 2² /{(3+2)(3-2)}
= 4/5