【2x(x的2次方y-xy的2次方)+xy(2xy-x的2次方)】÷(x的2次方y)
=[2x(x^2*y-xy^2)+xy(2xy-x^2)]÷(x^2*y)
=(2x^3*y-2x^2*y^2+2x^2y^2-x^3*y)÷(x^2*y)
=x^3*y/x^2y
=x
=2011
小芬是正确的,老师给的条件y=2012是多余的.
【2x(x的2次方y-xy的2次方)+xy(2xy-x的2次方)】÷(x的2次方y)
=[2x(x^2*y-xy^2)+xy(2xy-x^2)]÷(x^2*y)
=(2x^3*y-2x^2*y^2+2x^2y^2-x^3*y)÷(x^2*y)
=x^3*y/x^2y
=x
=2011
小芬是正确的,老师给的条件y=2012是多余的.