已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值已知:1/x+1/y=3 求:(3x-4xy+3y) /( x+2xy+y)的值
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已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值已知:1/x+1/y=3求:(3x-4xy+3y)/(x+2xy+y)的值已知1/x+1/y=3,求3x-4xy+3y/(x+2xy
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值已知:1/x+1/y=3 求:(3x-4xy+3y) /( x+2xy+y)的值
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值
已知:1/x+1/y=3 求:(3x-4xy+3y) /( x+2xy+y)的值
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值已知:1/x+1/y=3 求:(3x-4xy+3y) /( x+2xy+y)的值
同除xy
原式变形为:(3/y-4+3/x)/(1/x+2+1/y)=5/5=1