∵|x+2|+(y-2分之3)^2=0,∴ x-2=0 y-3/2=0 x=-2 y=3/2∴2分之1x2(x-3分之1y^2)+(-2分之3x+3分之1y) =x²-1/3y²-3/2x+1/3y =(-2)²-1/3(3/2)²-3/2*(-2)+1/3*3/2 =4-3/4+3+1/2 =7-1/4 =6又4分之3
