ГДЗ по математике 6 класс Дорофеев Задание 930

\[\boxed{\mathbf{930\ (930)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\textbf{а)}\ b = - \frac{1}{2} \Longrightarrow 10b = 10 \bullet \left( - \frac{1}{2} \right) = - \frac{10}{2} = - 5.\]

\[b = - 2,12 \Longrightarrow 10b = 10 \bullet ( - 2,12) = - (10 \bullet 2,12) = - 21,2.\]

\[b = - 0,3 \Longrightarrow 10b = 10 \bullet ( - 0,3) = - (10 \bullet 0,3) = - 3.\]

\[\textbf{б)}\ a = - 10 \Longrightarrow 3a = 3 \bullet ( - 10) = - (3 \bullet 10) = - 30.\]

\[a = - 1,5 \Longrightarrow 3a = 3 \bullet ( - 1,5) = - (3 \bullet 1,5) = - 4,5.\]

\[a = - \frac{7}{24} \Longrightarrow 3a = 3 \bullet \frac{- 7}{24} = - \frac{3 \bullet 7}{24} = - \frac{7}{8}.\]

\[\textbf{в)}\ x = 15 \Longrightarrow - 2x = - 2 \bullet 15 = - (2 \bullet 15) = - 30.\]

\[x = - 5,5 \Longrightarrow - 2x = - 2 \bullet ( - 5,5) = + (2 \bullet 5,5) = 11.\]

\[x = 0,8 \Longrightarrow - 2x = - 2 \bullet 0,8 = - (2 \bullet 0,8) = - 1,6.\]

\[x = - \frac{5}{6} \Longrightarrow - 2x = - 2 \bullet \left( - \frac{5}{6} \right) = - \frac{2}{1} \bullet \left( - \frac{5}{6} \right) = + \left( \frac{2 \bullet 5}{1 \bullet 6} \right) = \frac{10}{6} = 1\frac{4}{6} = 1\frac{2}{3}.\]

\[\textbf{г)}\ c = - 48 \Longrightarrow - 0,5c = - 0,5 \bullet ( - 48) = + (0,5 \bullet 48) = + \left( \frac{48}{2} \right) = 24.\ \]

\[c = - 1,6 \Longrightarrow - 0,5c = - 0,5 \bullet ( - 1,6) = + (0,5 \bullet 1,6) = \frac{1,6}{2} = 0,8.\]

\[c = 2,4 \Longrightarrow - 0,5c = - 0,5 \bullet 2,4 = - (0,5 \bullet 2,4) = - \left( \frac{2,4}{2} \right) = - 1,2.\]