(3x-2)²+|y-3|=0,因为(3x-2)²≥0,|y-3|≥0,所以(3x-2)²=0,|y-3|=0,得到x=2/3,y=3,5(x-y)-2(6x-2y+2)(4x-3y-1/2)=5×(2/3-3)-2×(6×2/3-2×3+2)×(4×2/3-3×3-1/2)=5×(-7/3)-2×0×(4×2/3-3×3-1/2)=-35/3-0=-35/3