Răspuns:
Explicație pas cu pas:
x°y=2xy-3x-3y+6=2xy-2x×3/2-2y×3/2+6=2(xy-3x/2-3y/2+3)=
=2[x(y-3/2)-3/2(y-3/2)+3/4]=2(x-3/2)(y-3/2)+3/2