.先化简,后计算.
问题描述：
.先化简,后计算.
[2x(x²y-xy²)+xy(xy-x²)]/x²y
x=2008,y=2004
答
[2x(x²y-xy²)+xy(xy-x²)]/x²y
=[2x^3y-2x^2y^2+x^2y^2-x^3y]/x²y
=x-y
=4