Решебник по математике 5 класс Виленкин Часть 1, 2 Часть 2. Параграф 5. Обыкновенные дроби Задание 330

\[\boxed{\text{5.330.}}\]

\[\textbf{а)}\ 245 \cdot (m - 33) = 4\ 410\]

\[m - 33 = 4\ 410\ :245\]

\[m - 33 = 18\]

\[m = 18 + 33\]

\[m = 51.\ \]

\[Ответ:51.\]

\[\textbf{б)}\ 864k - 470k = 5\ 910\]

\[394k = 5\ 910\]

\[k = 5\ 910\ :394\]

\[k = 15.\ \]

\[Ответ:15.\]

\[\textbf{в)}\ (3x + 12)\ :72 = 21\]

\[3x + 12 = 21 \cdot 72\]

\[3x + 12 = 1\ 512\]

\[3x = 1\ 512 - 12\]

\[3x = 1\ 500\]

\[x = 1\ 500\ :3\]

\[x = 500\text{.\ }\]

\[Ответ:500.\ \]

\[\textbf{г)}\ 420\ :(y - 15) = 84\ \]

\[y - 15 = 420\ :84\]

\[y - 15 = 5\]

\[y = 5 + 15\]

\[y = 20.\ \]

\[Ответ:20.\ \]