9. Вычислите: 5(√7)² + (2/7 ⋅ √245)² - 5 ⋅ √(10 6/25)

5(√7)² + (2/7 ⋅ √245)² - 5 ⋅ √(10 6/25) = 5 × 7 + (2/7 × √(49 × 5))² - 5 × √(256/25) = 35 + (2/7 × 7√5)² - 5 × (16/5) = 35 + (2√5)² - 16 = 35 + 4 × 5 - 16 = 35 + 20 - 16 = 55 - 16 = 39

Ответ: 39