Решебник по математике 5 класс Алышева Нахождение неизвестного уменьшаемого Задание 4

\[\boxed{\mathbf{4.}}\]

\[x - 20 = 30\]

\[x = 30 + 20\]

\[x = 50.\]

\[Проверка.\]

\[50 - 20 = 30\]

\[30 = 30.\]

\[x - 30 = 60\]

\[x = 60 + 30\]

\[x = 90.\]

\[Проверка.\]

\[90 - 30 = 60\]

\[60 = 60.\]

\[x - 5 = 25\]

\[x = 25 + 5\]

\[x = 30.\]

\[Проверка.\]

\[30 - 5 = 25\]

\[25 = 25.\]

\[x - 4 = 36\]

\[x = 36 + 4\]

\[x = 40.\]

\[Проверка.\]

\[40 - 4 = 36\]

\[36 = 36.\]

\[x - 1 = 44\]

\[x = 44 + 1\]

\[x = 45.\]

\[Проверка.\]

\[45 - 1 = 44\]

\[44 = 44.\]

\[x - 2 = 53\]

\[x = 53 + 2\]

\[x = 55.\]

\[Проверка.\]

\[55 - 2 = 53\]

\[53 = 53.\]