\[\boxed{\text{30.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[1 < \sqrt{3} < 2;\]
\[2 < \sqrt{5} < 3;\]
\[2 < \sqrt{8} < 3;\]
\[3 < \sqrt{10} < 4;\]
\[4 < \sqrt{20} < 5;\]
\[7 < \sqrt{50} < 8;\]
\[8 < \sqrt{75} < 9.\]