已知1\x减1\y等于五,3x加5xy减3y\2y减7xy减2x的值?
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![已知1\x减1\y等于五,3x加5xy减3y\2y减7xy减2x的值?](/uploads/image/z/174081-57-1.jpg?t=%E5%B7%B2%E7%9F%A51%5Cx%E5%87%8F1%5Cy%E7%AD%89%E4%BA%8E%E4%BA%94%2C3x%E5%8A%A05xy%E5%87%8F3y%5C2y%E5%87%8F7xy%E5%87%8F2x%E7%9A%84%E5%80%BC%3F)
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已知1\x减1\y等于五,3x加5xy减3y\2y减7xy减2x的值?
已知1\x减1\y等于五,3x加5xy减3y\2y减7xy减2x的值?
已知1\x减1\y等于五,3x加5xy减3y\2y减7xy减2x的值?
(3x+5xy-3y)/(2y-7xy-2x) =(3/y+5-3/x)/(2/x-7-2/y) =[5-3(1/x-1/y)]/[2(1/x-1/y)-7] =(5-15)/(10-7) =-10/3