已知1/x-1/y=5,求3x+5xy-3y/x-y-3xy的值.是3xy_作业帮
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已知1/x-1/y=5,求3x+5xy-3y/x-y-3xy的值.是3xy
已知1/x-1/y=5,求3x+5xy-3y/x-y-3xy的值.是3xy
因为1/x-1/y=5所以1/y-1/x=-5所以（3x+5xy-3y)/(x-y-3xy)=[(3x+5xy-3y)÷xy]/[(x-y-3xy)÷xy]=[(3/y+5-3/x)]/(1/y-1/x-3)=[3(1/y-1/x)+5]/(1/y-1/x-3)=[3(-5)+5]/(-5-3)=-10/(-8)=5/4已知1/x-1/y=5，求分式3x+5xy-3y/x-3xy-y的值_百度知道
已知1/x-1/y=5，求分式3x+5xy-3y/x-3xy-y的值
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(x-y)-3xy=3*(-5xy)+5xy/-5xy-3xy=-10xy/xy=5y-x=5xyx-y=-5xy3x+5xy-3y/x-1/y=5(y-x)&#471/x-3xy-y=3(x-y)+5xy/-8xy=5&#47
来自团队：已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值._作业帮
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已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值.
已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值.
1/x-1/y=5(y-x)/xy=5y-x=5xyx-y=-5xy3x+5xy-3y/x-3xy-y=3(x-y)+5xy/(x-y)-3xy=3*(-5xy)+5xy/-5xy-3xy=-10xy/-8xy=5/4已知1/x+1/y=2,求分式3x+7xy+3y/2x-5xy+2y的值_作业帮
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已知1/x+1/y=2,求分式3x+7xy+3y/2x-5xy+2y的值
已知1/x+1/y=2,求分式3x+7xy+3y/2x-5xy+2y的值
1/x+1/y=(x+y)/xy=2x+y=2xy(3x+7xy+3y)/(2x-5xy+2y)=[3(x+y)+7xy]/[2(x+y)-5xy]=(6xy+7xy)/(4xy-5xy)=13xy/(-xy)=-13已知1/x-1/y=5，求分式3x+5xy-3y/x-3xy-y的值。
已知1/x-1/y=5，求分式3x+5xy-3y/x-3xy-y的值。
1/x-1/y=y-x/xy=5y-x=5xy3x-3y=-15xyx-y-3xy=-8xy原式=10xy/8xy=10/8=5/4
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