a) Решение: x + 6 >= 0 => x >= -6. 2x - 5 >= 0 => x >= 2.5. √x + 6 - √2x - 5 != 0 => √x + 6 != √2x - 5 => x + 6 != 2x - 5 => x != 11. Ответ: x >= 2.5 и x != 11.
б) Решение: 2x - 1 >= 0 => x >= 0.5. x + 1 >= 0 => x >= -1. √2x - 1 - √x + 1 != 0 => √2x - 1 != √x + 1 => 2x - 1 != x + 1 => x != 2. Ответ: x >= 0.5 и x != 2.