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

Ответ:

\[x^{3}\text{\ \ \ \ \ }\]

\[x = 4:\]

\[4^{3} = 4^{2} \cdot 4 = 16 \cdot 4 = 64.\]

\[x = - 5:\]

\[( - 5)^{3} = - 5^{3} = - 5^{2} \cdot 5 =\]

\[= - 25 \cdot 5 = - 125.\]

\[x = 0,4:\]

\[(0,4)^{3} = 0,064.\]

\[x = \frac{2}{3}:\]

\[\left( \frac{2}{3} \right)^{3} = \frac{2^{3}}{3^{3}} = \frac{8}{27}.\]