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已知x-y/xy=2,求分式7x-5xy-7y/5x-5y 解,得: x-y/xy=2 x-y=2xy 由7x-5xy-7y/5x-5y得, ==7x-5xy-7y/5(x-y) ==7(x-y)-5xy/10xy ==14xy-5xy/10xy ==9xy/10xy ==9/10 ==0.9
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