Решебник по математике 5 класс Виленкин Часть 1, 2 Часть 2. Задачи на повторение 35

\[\boxed{\text{П.35.}}\]

\[\textbf{а)}\ 26z + z - 20 = 61\ \]

\[27z = 61 + 20\]

\[27z = 81\]

\[z = 81\ :27\]

\[z = 3.\ \]

\[Ответ:3.\ \]

\[\textbf{б)}\ 19x - 6x + 74 = 100\]

\[13x = 100 - 74\]

\[13x = 26\]

\[x = 26\ :13\]

\[x = 2.\ \]

\[Ответ:2.\ \]

\[\textbf{в)}\ (13c - 8c) \cdot 9 = 90\]

\[5c = 90\ :9\]

\[5c = 10\]

\[c = 10\ :5\]

\[c = 2.\ \]

\[Ответ:2.\ \]

\[\textbf{г)}\ (7a + a)\ :3 = 4\]

\[8a = 4 \cdot 3\]

\[8a = 12\]

\[a = 12\ :8\]

\[a = 1,5\text{.\ }\]

\[Ответ:1,5.\ \ \ \]