Найдем значение выражения √13-2²⋅√13⋅6².
√13-2²⋅√13⋅6² = √(13 - 2²) ⋅ √(13 ⋅ 6²) = √(13 - 4) ⋅ √(13 ⋅ 36) = √9 ⋅ √(13 ⋅ 36) = 3 ⋅ √(13 ⋅ 36) = 3 ⋅ √13 ⋅ √36 = 3 ⋅ 6 ⋅ √13 = 18√13
Ответ: 18√13