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xy/x-z-xy/y-z 分式化简
人气:124 ℃ 时间:2020-01-28 05:20:38
解答
xy/x-z-xy/y-z =[xy(y-z)-xy(x-z)]/(x-z)(y-z)=xy(y-x)/[(x-z)(y-z)]
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