ГДЗ по алгебре 9 класс Макарычев Задание 154

\[\boxed{\text{154\ (154).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[x = 10\ см;\ \ m = 700\ грамм.\]

\[m = \rho V;\ \ \ V = x^{3};\]

\[\Longrightarrow m = \rho x^{3} \Longrightarrow \ \rho = \frac{m}{x^{3}} =\]

\[= \frac{700}{10^{3}} = 0,7.\]

\[Значит,\ m(x) = 0,7x^{3}.\]

\[\textbf{а)}\ x = 2:\ \ \ m \approx 5,4;\]

\[x = 5:\ \ \ m \approx 87;\]

\[\textbf{б)}\ m = 30:\ \ \ x \approx 3,5;\]

\[m = 100:\ \ \ x \approx 5,2.\ \]

\[\boxed{\text{154.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]

\[\textbf{а)}\ y = - \frac{1}{2}x^{2} + 5\]

\[\textbf{б)}\ y = x² - 4x\]

\[\textbf{в)}\ y = - x^{2} + 6x - 9\]