3х^3 - 2y^3-6x^2*y^2+xy x=2/3, y=1/2
3*(2/3)^3 -2*(1/2)^3-6*(2/3)^2*(1/2)^2+ 2/3*1/2= 3*8/27-2*1/8-6*4/9*1/4+1/3= 8/9-1/4-2/3+1/3= (4*8-9*1-12*1)/36= (32-9-12)/36= 11/36
3х^3 - 2y^3-6x^2*y^2+xy x=2/3, y=1/2
3*(2/3)^3 -2*(1/2)^3-6*(2/3)^2*(1/2)^2+ 2/3*1/2= 3*8/27-2*1/8-6*4/9*1/4+1/3= 8/9-1/4-2/3+1/3= (4*8-9*1-12*1)/36= (32-9-12)/36= 11/36