▏x+1 ▏+（y-2/3)²=0
∴x+1=0
y-2/3=0
∴x=-1
y=2/3
1/2x-2(-x+1/3y²)
=x/2+2x-2y²/3
=5x/2-2y²/3
=-5/2-8/27
=-151/54
若x,y满足▏x+1 ▏+（y-2/3)²=0.求式子1/2x-2(-x+1/3y²的值
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