-1/3(X^2y^2-xy+3)+2[X^2-1/2（XY-2X+Y-1)]+3X-1，其中X=—4，Y=3
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-1/3(X^2y^2-xy+3)+2[X^2-1/2（XY-2X+Y-1)]+3X-1，其中X=—4，Y=3
-1/3(X^2y^2-xy+3)+2[X^2-1/2（XY-2X+Y-1)]+3X-1
=-X^2y^2/3+xy/3-1+2X^2-（XY-2X+Y-1)+3X-1
=-X^2y^2/3+xy/3-1+2X^2-XY+2X-Y+1+3X-1
=-X^2y^2/3-2xy/3+2X^2+5X-Y-1
=-(-4)^2*3^2/3-2(-4)*3/3+2(-4)^2+5(-4)-3-1
=-48+8+32-20-3-1
=-32
-1/3(X^2y^2-xy+3)+2[X^2-1/2（XY-2X+Y-1)]+3X-1
=-X^2y^2/3+xy/3-1+2X^2-（XY-2X+Y-1)+3X-1
=-X^2y^2/3+xy/3-1+2X^2-XY+2X-Y+1+3X-1
=-X^2y^2/3-2xy/3+2X^2+5X-Y-1
=-(-4)^2*3^2/3-2(-4)*3/3+2(-4)^2+5(-4)-3-1
=-48+8+32-20-3-1
=-32
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