Ответы: 1
2017-09-30 23:30
X + 3x — 5x — 15x + 4x + 12 = 0 x(x + 3) — 5x(x + 3) + 4(x + 3) = 0 (x + 3)(x — 5x + 4) = 0 1) x + 3 = 0 x = -3 2) x — 5x + 4 = 0 t = x, t 0 t — 5t + 4 = 0 t + t = 5 tt = 4 t = 1; t = 4 Обратная замена: x = 1 x = -1; 1 x = 4 x = -2; 2 Ответ: x = -3; -2; -1; 1; 2.