\[\boxed{\text{918.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ \sqrt{2}\ \ \notin (1,5;2,4);\]
\[\textbf{б)}\ \sqrt{3}\ \in (1,5;2,4);\]
\[\textbf{в)}\ \sqrt{5}\ \in \ (1,5;2,4);\]
\[\textbf{г)}\ \sqrt{6}\ \notin (1,5;2,4).\]