已知x分之1-y分之1=3,则分式(x-2xy-y)分之(2x+3xy-2y)的值为?
人气:381 ℃ 时间:2019-10-17 14:36:33
解答
由1/x-1/y=3得(y-x)/xy=3题中的式子分子分母同时除以xy得(2/y+3-2/x)/(1/y-2-1/x),通分得【2(x-y)/xy+3】/【(x-y)/xy-2】代入得3/5
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