若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值

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若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值若x+3y=0,xy不等于0,则分式(xy+y^2)

若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值
若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值

若x+3y=0,xy不等于0,则分式(xy+y^2)分之x^2-3xy的值
x+3y=0,所以X=-3Y
代入得（9Y^2+9Y^2)/(-3Y^2+Y^2)=-9