Ан Анастасия xy(x² + y² : 2xy - 1) = xy(x² + y : 2x - 1) = x³y + y² : 2 - xy x = -4, y = -3 -4³ ⋅ -3 + -3² : 2 - (-4) ⋅ -3 = -64 ⋅ -3 + 9 : 2 - (-4) ⋅ -3 = 192 + 4,5 - 12 = 184,5