ГДЗ по математике 6 класс Дорофеев Задание 941

\[\boxed{\mathbf{941\ (941)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[\textbf{а)} - \frac{5}{6} + 5 \bullet \left( - \frac{2}{15} \right) = - \frac{5}{6} + \left( - \left( 5 \bullet \frac{2}{15} \right) \right) = - \frac{5}{6} + \left( - \frac{5 \bullet 2}{1 \bullet 15} \right) =\]

\[= - \frac{5}{6} + \left( - \frac{2}{3} \right) = \frac{- 5}{6} - \frac{4}{6} = \frac{- 5 - 4}{6} = \frac{- 9}{6} = - \frac{3}{2} = - 1,5.\]

\[\textbf{б)}\ \left( - \frac{5}{6} + 5 \right) \bullet \left( - \frac{2}{15} \right) = \left( - \frac{5}{6} + \frac{30}{6} \right) \bullet \left( - \frac{2}{15} \right) = \left( \frac{- 5 + 30}{6} \right) \bullet \left( - \frac{2}{15} \right) =\]

\[= \frac{26}{6} \bullet \left( - \frac{2}{15} \right) = - \frac{25 \bullet 2}{6 \bullet 15} = - \frac{5}{9}\]

\[\textbf{в)} - 12 \bullet \frac{3}{4} - 2 \bullet \frac{5}{12} = - \frac{12 \bullet 3}{1 \bullet 4} - \frac{2 \bullet 5}{1 \bullet 12} = - 9 - \frac{5}{6} = - \left( 9 + \frac{5}{6} \right) = - 9\frac{5}{6}\]

\[\textbf{г)} - 12 \bullet \left( \frac{3}{4} - 2 \right) \bullet \frac{5}{12} = - 12 \bullet \left( \frac{3}{4} - \frac{8}{4} \right) \bullet \frac{5}{12} = - 12 \bullet \left( - \frac{5}{4} \right) \bullet \frac{5}{12} =\]

\[= + \left( \frac{12}{1} \bullet \frac{5}{4} \bullet \frac{5}{12} \right) = \frac{25}{4} = 6\frac{1}{4}\]