Вычислите значение выражения a^2 при a=9; -7; 0,6; 5/6; -2 1/3.

\[a^{2}\text{\ \ \ \ }\]

\[a = 9:\]

\[9^{2} = 81.\]

\[a = - 7:\ \]

\[( - 7)^{2} = 7^{2} = 49.\]

\[a = 0,6:\]

\[(0,6)^{2} = 0,36.\]

\[a = \frac{5}{6}:\ \]

\[\left( \frac{5}{6} \right)^{2} = \frac{5^{2}}{6^{2}} = \frac{25}{36}.\]

\[a = - 2\frac{1}{3} = - \frac{7}{3}:\]

\[\left( - \frac{7}{3} \right)^{2} = \left( \frac{7}{3} \right)^{2} = \frac{7^{2}}{3^{2}} = \frac{49}{9} = 5\frac{4}{9}.\]