\[\boxed{\text{315\ (315).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[s = 12\ км:\]
\[v,\ км/ч\] | \[5\] | \[12\ :3 = 4\] | \[2,4\] | \[12\ :3\frac{1}{3} = 3,6\] |
---|---|---|---|---|
\[t,\ ч\] | \[12\ :5 = 2,4\] | \[3\] | \[12\ :2,4 = 5\] | \[3\frac{1}{3}\] |
\[\boxed{\text{315.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = 2,7x - 8\ \ \ \ и\ \ \ y = 1,2x + 7\]
\[2,7x - 8 = 1,2x + 7\]
\[2,7x - 1,2x = 7 + 8\]
\[1,5x = 15\]
\[x = 15\ :1,5 = 150\ :15\]
\[x = 10\]
\[y = 2,7 \cdot 10 - 8 = 27 - 8 = 19.\]
\[A(10;19) - точка\ пересечения\ \]
\[графиков\ данных\ функций.\]
\[Ответ:A\ (10;19).\]