9. Вычислите: 1) a) √1369-√1681; 6) 2/0,1156-0,4761; 2) a) 6) 5 V4225 1 V361 25 V19 +V6,25;

1. а) $$ \sqrt{1369} - \sqrt{1681} = 37 - 41 = -4 $$
2. б) $$ 2\sqrt{0.1156} - \sqrt{0.4761} = 2 \cdot 0.34 - 0.69 = 0.68 - 0.69 = -0.01 $$

1. а) $$ \frac{5}{\sqrt{4225}} = \frac{5}{65} = \frac{1}{13} $$
2. б) $$ \frac{1}{\sqrt{361}} + \sqrt{6.25} = \frac{1}{19} + 2.5 = \frac{1}{19} + \frac{25}{10} = \frac{1}{19} + \frac{5}{2} = \frac{2 + 95}{38} = \frac{97}{38} $$

Ответ: 1) а) -4; б) -0.01; 2) а) $$\frac{1}{13}$$; б) $$\frac{97}{38}$$