Решебник по математике 5 класс Виленкин Часть 1, 2 Часть 2. Параграф 5. Обыкновенные дроби Задание 332

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\[\textbf{а)}\ \frac{15}{25} = \frac{c}{5}\]

\[\frac{15\ :5}{25\ :5} = \frac{c}{5}\]

\[\frac{3}{5} = \frac{c}{5}\]

\[c = 3\text{.\ }\]

\[Ответ:3\text{.\ }\]

\[\textbf{б)}\ \frac{m}{12} = \frac{5}{6}\]

\[\frac{m}{12} = \frac{5 \cdot 2}{6 \cdot 2}\]

\[\frac{m}{12} = \frac{10}{12}\]

\[m = 10\text{.\ }\]

\[Ответ:10.\]

\[\textbf{в)}\ \frac{19}{76} = \frac{1}{a}\]

\[\frac{19\ :19}{76\ :19} = \frac{1}{a}\]

\[\frac{1}{4} = \frac{1}{a}\]

\[a = 4\text{.\ }\]

\[Ответ:4.\ \]

\[\textbf{г)}\ \frac{15}{y} = \frac{5}{6}\]

\[\frac{15}{y} = \frac{5 \cdot 3}{6 \cdot 3}\]

\[\frac{15}{y} = \frac{15}{18}\]

\[y = 18\text{.\ }\]

\[Ответ:18.\ \ \]