Найдите значение выражения: 4-2,5x при x=6; -3; -2/3; 0,7.

\[4 - 2,5x\]

\[x = 6:\]

\[4 - 2,5 \cdot 6 = 4 - 15 = - 11.\]

\[x = - 3:\]

\[4 - 2,5 \cdot ( - 3) = 4 + 7,5 = 11,5.\]

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

\[4 - 2,5 \cdot \left( - \frac{2}{3} \right) = 4 + \frac{25}{10} \cdot \frac{2}{3} =\]

\[= 4 + \frac{25 \cdot 2}{10 \cdot 3} = 4^{\backslash 3} + \frac{5}{3} =\]

\[= \frac{12}{3} + \frac{5}{3} = \frac{17}{3} = 5\frac{2}{3}.\]

\[x = 0,7:\]

\[4 - 2,5 \cdot 0,7 = 4 - 1,75 = 2,25.\]