\[\boxed{\text{618\ (618).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
Пояснение.
Решение.
\[\textbf{а)}\ 3 \cdot (2x - 1) + 5 \cdot (3 - x) =\]
\[= 3 \cdot 2x - 3 + 5 \cdot 3 - 5x =\]
\[если\ x = - 1,5:\]
\[- 1,5 + 12 = 10,5.\]
\[= - a + 39\]
\[если\ a = 11:\]
\[\ ( - 11) + 39 = 28.\text{\ \ }\]
\[= 4y - 2 \cdot 10y + 2 + 8y - 2 =\]
\[= 4y - 20y + 8y = - 8y\]
\[если\ y = - 0,1:\text{\ \ }\]
\[( - 8) \cdot ( - 0,1) = 0,8.\ \text{\ \ }\]
\[= - 10p + 15\]
\[если\ p = 2:\ \]
\[( - 10) \cdot 2 + 15 = - 20 + 15 =\]
\[= - 5.\text{\ \ }\]