先化简,再求值：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2,其中x=-4,y=二分之一

当x=-4,y=1/2时
5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2
= 5xy²-3xy²+4xy²-2x²y+2x²y-xy²
=5xy²=5×(-4)×(1/2)²=-5