x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是

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x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是x+3y=0,xy≠0,则分式(x^2-3xy)/(xy

x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是
x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是

x+3y=0,xy≠0,则分式(x^2-3xy)/(xy+y^2）的值是
原式=（9y^2+9y^2）/(-3y^2+y^2)=-9

我代入解的是-36y^4

-9