\[7\ и\ \sqrt{102} \Longrightarrow 7 = \sqrt{49} \Longrightarrow\]
\[\Longrightarrow \sqrt{64} = 8;\ \ \sqrt{81} = 9;\ \ \]
\[\sqrt{100} = 10.\]
\[Ответ:8;\ \ 9;\ \ 10.\]