Решение:
- 5. 5x (2x + 3) - (x - 1) (x - 6)
- \[ (10x^2 + 15x) - (x^2 - 6x - x + 6) \]
- \[ 10x^2 + 15x - (x^2 - 7x + 6) \]
- \[ 10x^2 + 15x - x^2 + 7x - 6 \]
- \[ 9x^2 + 22x - 6 \]
- 6. (a - e)² - e (a - 3c)
- \[ (a^2 - 2ae + e^2) - (ea - 3ce) \]
- \[ a^2 - 2ae + e^2 - ea + 3ce \]
- \[ a^2 - 3ae + e^2 + 3ce \]
Ответ: 5. 9x² + 22x - 6; 6. a² - 3ae + e² + 3ce.