\[\boxed{\text{299\ (299).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ \sqrt{121} = 11\ \]
\[так\ как\ \]
\[11 > 0;\]
\[11^{2} = 121.\]
\[\textbf{б)}\ \sqrt{169} = 13\]
\[так\ как\ \]
\[13 > 0;\]
\[13^{2} = 169.\ \]
\[\textbf{в)}\ \sqrt{1,44} = 1,2\]
\[так\ как\ \]
\[1,2 > 0;\]
\[{1,2}^{2} = 1,44.\]
\[\textbf{г)}\ \sqrt{0,49} = 0,7\]
\[так\ как\ 0,7 > 0;\]
\[{0,7}^{2} = 0,49.\ \]