Вычислите значение выражения x^2 при x=7; -11; 0,8; -4/5; 1 1/3.

Ответ:

\[x^{2}\]

\[x = 7:\]

\[x^{2} = 7^{2} = 49.\]

\[x = - 11:\]

\[x^{2} = ( - 11)^{2} = 11^{2} = 121.\]

\[x = 0,8:\]

\[x^{2} = (0,8)^{2} = 0,64.\]

\[x = - \frac{4}{5}:\]

\[x^{2} = \left( - \frac{4}{5} \right)^{2} = \left( \frac{4}{5} \right)^{2} = \left( \frac{8}{10} \right)^{2} =\]

\[= (0,8)^{2} = 0,64.\]

\[x = 1\frac{1}{3} = \frac{4}{3}:\]

\[x^{2} = \left( \frac{4}{3} \right)^{2} = \frac{4^{2}}{3^{2}} = \frac{16}{9} = 1\frac{7}{9}\text{.\ }\]