Odpowiedź :
x=-2 ; y=(1/3)
2y-(2x+y)² =2*(1/3)-(2*(-2)+(1/3))²=(2/1)*(1/3)-(-4+1/3)²=(2/3)-((-12/3)+(1/3))²=(2/3)-(-11/3)²=(2/3)-(121/9)=(6/9)-(121/9)=-115/9=-12 i 7/9
2y-(2x+y)² =2*(1/3)-(2*(-2)+(1/3))²=(2/1)*(1/3)-(-4+1/3)²=(2/3)-((-12/3)+(1/3))²=(2/3)-(-11/3)²=(2/3)-(121/9)=(6/9)-(121/9)=-115/9=-12 i 7/9