\[\boxed{\mathbf{656}.}\]
\[g(p) = \frac{70}{3p + 5} - 2\]
\[1)\ p - цена\ товара \Longrightarrow p \geq 0.\]
\[\frac{70}{3p + 5} - 2 \geq 0\]
\[\frac{70 - 6p - 10}{3p + 5} \geq 0\]
\[\frac{- 6 \cdot (p - 10)}{3 \cdot \left( p + \frac{5}{3} \right)} \geq 0\]
\[Область\ определения:\ \ \lbrack 0;10\rbrack.\]
\[Множество\ значений:\]
\[q(0) = \frac{70}{5} - 2 = 14 - 2 = 12.\]
\[q(10) = \frac{70}{35} - 2 = 2 - 2 = 0.\]
\[\lbrack 0;12\rbrack.\]
\[2)\ Объем\ спроса\ при\]
\[\ цене\ p = 5:\]
\[q(5) = \frac{70}{20} - 2 = 3,5 - 2 = 1,5.\]
\[3)\ q = \frac{70 - 2 \cdot (3p + 5)}{3p + 5};\]
\[q(3p + 5) = 70 - 6p - 10\]
\[3pq + 5q = 60 - 6p\]
\[3pq + 6p = 60 - 5q\]
\[p(3q + 6) = 60 - 5q\]
\[p = \frac{60 - 5q}{3q + 6}.\]
\[Функция,\ обратная\ функции\ \]
\[спроса:\]
\[q(p) = \frac{60 - 5p}{3p + 6}.\]