\[\boxed{\text{360}\text{\ (360)}\text{.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = \left\{ \begin{matrix} x,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x \leq 0 \\ 4x - x^{2},\ \ 0 < x < 5 \\ x - 10,\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x \geq 5 \\ \end{matrix} \right.\ \]
\[y = x - прямая;\]
\[y = x - 10\ (прямая)\]
\[x\] | \[5\] | \[6\] |
---|---|---|
\[y\] | \[- 5\] | \[- 4\] |
\[a = - 1 < 0 - ветви\ вниз;\]
\[x_{0} = \frac{- 4}{- 2} = 2;\]
\[y_{0} = - 4 + 8 = 4.\]
\[(2;4) - вершина\ параболы.\]
\[\text{Ox}:\ \]
\[- x(x - 4) = 0\]
\[x = 0,\ \ x = 4.\]
\[\text{Oy}:\ \ \ x = 0,\ \ y = 0.\]
\[y(1) = - 1 + 4 = 3;\ \ \]
\[y( - 1) = - 1 - 4 = - 5.\]
\[E(y) = ( - \infty;4\rbrack.\]
\[возрастает:\ \ ( - \infty;2\rbrack\ и\ \]
\[\ \lbrack 5;\ + \infty);\]
\[убывает:\ \ \lbrack 2;5\rbrack.\]