Решебник по математике 5 класс Виленкин ФГОС Часть 1, 2 Часть 2. Параграф 6. Десятичные дроби Задание 219

\[\boxed{\text{6.219.}}\]

\[\textbf{а)}\ 5n - 2n = 8,4\]

\[3n = 8,4\]

\[n = 8,4\ :3\]

\[n = 2,8.\ \]

\[Ответ:2,8.\ \]

\[\textbf{б)}\ 2m + 6m = 9,6\]

\[8m = 9,6\]

\[m = 9,6\ :8\]

\[m = 1,2.\ \]

\[Ответ:1,2.\ \]

\[\textbf{в)}\ x + x + 9,246 = 48\]

\[2x = 48 - 9,246\]

\[2x = 38,754\]

\[x = 38,754\ :2\]

\[x = 19,377.\]

\[Ответ:19,377.\]

\[\textbf{г)}\ 7y - 4y - 58,2 = 72,12\]

\[3y = 72,12 + 58,2\]

\[3y = 130,32\]

\[y = 130,32\ :3\]

\[y = 43,44.\ \]

\[Ответ:43,44.\]