Решебник по математике 5 класс Виленкин Часть 1, 2 Часть 1. Параграф 3. Умножение и деление натуральных чисел Задание 205

\[\boxed{\mathbf{3.}\mathbf{205}}\]

\[\textbf{а)}\ 6a + 6a = 636\]

\[12a = 636\]

\[a = 636\ :12\]

\[a = 53.\]

\[\textbf{б)}\ 15b - 8b = 721\]

\[7b = 721\]

\[b = 721\ :7\]

\[b = 103.\]

\[\textbf{в)}\ 9t + t = 7000\]

\[10t = 7000\]

\[t = 7000\ :10\]

\[t = 700.\]

\[\textbf{г)}\ 10s - s = 540\]

\[9s = 540\]

\[s = 540\ :9\]

\[s = 60.\]

\[\textbf{д)}\ l + 3l + 6l = 1800\]

\[10l = 1800\]

\[l = 1800\ :10\]

\[l = 180.\]

\[\textbf{е)}\ 5t + 4t - t = 7200\]

\[8t = 7200\]

\[t = 7200\ :8\]

\[t = 900.\]