2分之1x-2[3-(x-3分之1y²)]+(-2分之3x+3分之2y²)
=2分之1x-2(3-x+3分之1y²)+(-2分之3x+3分之2y²)
=2分之1x-6+2x-3分之2y²-2分之3x+3分之2y²
=x-6
=-1-6
=-7