(x+2)2+|y+1|=0,
则x+2=0,y+1=0
则x=-2,y=-1
5xy2-{2x2y-[3xy2-(4xy2-2x2y)]}
=5xy²-2x²y+3xy²-4xy²+2x²y
=4xy²
=4×(-2)×(-1)²
=-8