№ 2. Вычислить: 1) √25 − √49; 2) √16·√9; 3) 3√4 − √36; 4) √64 : √900; 5) √0,36 + √0,01; 6) (1/8)√0,64 − 1.

1. \(\sqrt{25}-\sqrt{49}=5-7=-2\).
2. \(\sqrt{16}\cdot\sqrt{9}=4\cdot3=12\).
3. \(3\sqrt{4}-\sqrt{36}=3\cdot2-6=0\).
4. \(\sqrt{64}:\sqrt{900}=8:30=\frac{4}{15}\).
5. \(\sqrt{0.36}+\sqrt{0.01}=0.6+0.1=0.7\).
6. \(\frac{1}{8}\sqrt{0.64}-1=\frac{1}{8}\cdot0.8-1=0.1-1=-0.9\).

Ответ: 1) −2; 2) 12; 3) 0; 4) 4/15; 5) 0,7; 6) −0,9.