Решите уравнение: x²-x+9=(x+2)²
X^2 - x + 9 = x^2 + 4x + 4 x^2 - x + 9 - x^2 - 4x - 4 = 0 - x + 9 - 4x - 4 = 0 - 5x + 5 = 0 - 5x = - 5 x = 1