2. Вычислить: 1) \(\sqrt{144\cdot0,49}\); 2) \(\sqrt{72\cdot0,5}\); 3) \(\sqrt{6\frac{1}{4}}\); 4) \(\sqrt{(-3)^6}\).

1. \(\sqrt{144\cdot0.49}=\sqrt{144}\cdot\sqrt{0.49}=12\cdot0.7=8.4\).
2. \(\sqrt{72\cdot0.5}=\sqrt{36}=6\).
3. \(\sqrt{6\frac{1}{4}}=\sqrt{\frac{25}{4}}=\frac{5}{2}=2.5\).
4. \(\sqrt{(-3)^6}=\sqrt{729}=27\).

Ответ: 1) 8,4; 2) 6; 3) 2,5; 4) 27.