\[4 = \sqrt{16};\ \ 3,8 = \sqrt{14,44};\ \ \sqrt{15};\ \ \]
\[\sqrt{19};\ \ 4,3 = \sqrt{18,49}.\]
\[Ответ:3,8;\ \ \sqrt{15};\ \ 4;\ \ 4,3;\ \ \sqrt{19}.\]