已知y-x=3xy 求2x+5xy-2y/x-2xy-y已知分式x(x-3)/(x^2+1)的值为零,则2x/(x^2-1)÷3x/(1-x)的值为多少,

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已知y-x=3xy 求2x+5xy-2y/x-2xy-y已知分式x(x-3)/(x^2+1)的值为零,则2x/(x^2-1)÷3x/(1-x)的值为多少,

已知y-x=3xy 求2x+5xy-2y/x-2xy-y已知分式x(x-3)/(x^2+1)的值为零,则2x/(x^2-1)÷3x/(1-x)的值为多少,
已知y-x=3xy 求2x+5xy-2y/x-2xy-y
已知分式x(x-3)/(x^2+1)的值为零,则2x/(x^2-1)÷3x/(1-x)的值为多少,

已知y-x=3xy 求2x+5xy-2y/x-2xy-y已知分式x(x-3)/(x^2+1)的值为零,则2x/(x^2-1)÷3x/(1-x)的值为多少,
∵x^2+1≠0,所以X（X-3）=0
∴X=0或3
化简第二个式子：原式=-2/3x+3
当x=0时,原式=-2/3
当x=3时,原式=-1/6

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