290. Вычислите: а) \(\sqrt{400}\); б) \(\sqrt{900}\); в) \(\sqrt{4900}\); г) \(\sqrt{0,01}\); д) \(\sqrt{0,16}\); е) \(\sqrt{0,64}\); ж) \(\sqrt{\frac{36}{49}}\); з) \(\sqrt{\frac{121}{64}}\); и) \(\sqrt{1\frac{7}{9}}\); к) \(\sqrt{6\frac{1}{4}}\).

1. \(\sqrt{400}=20\).
2. \(\sqrt{900}=30\).
3. \(\sqrt{4900}=70\).
4. \(\sqrt{0.01}=0.1\).
5. \(\sqrt{0.16}=0.4\).
6. \(\sqrt{0.64}=0.8\).
7. \(\sqrt{\frac{36}{49}}=\frac{6}{7}\).
8. \(\sqrt{\frac{121}{64}}=\frac{11}{8}\).
9. \(\sqrt{1\frac{7}{9}}=\sqrt{\frac{16}{9}}=\frac{4}{3}\).
10. \(\sqrt{6\frac{1}{4}}=\sqrt{\frac{25}{4}}=\frac{5}{2}\).

Ответ: 20; 30; 70; 0,1; 0,4; 0,8; \(\frac{6}{7}\); \(\frac{11}{8}\); \(\frac{4}{3}\); \(\frac{5}{2}\).