1.
|x+y+2|+（2x-3y-1）²=0
所以
|x+y+2|=0,（2x-3y-1）²=0
x+y=-2
2x-3y=1
解得
x=-1
y=-1
所以
2.
2x³-x²-3y³
=-2-1+3
=0