已知x/y=2/3,求（x²-y²）/xy÷[（x+y）（x-y/x）³]
人气：134 ℃ 时间：2019-10-31 12:20:24
解答
x＝2y=3 或者负的帮我化简一下后面的分式把xy放到上面就行了
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