Решебник по математике 5 класс Алышева Нахождение неизвестного слагаемого Задание 5

\[\boxed{\mathbf{5.}}\]

\[2 + x = 20\]

\[x = 20 - 2\]

\[x = 18.\]

\[Проверка.\]

\[2 + 18 = 20\]

\[20 = 20.\]

\[x + 4 = 40\]

\[x = 40 - 4\]

\[x = 36.\]

\[Проверка.\]

\[36 + 4 = 40\]

\[40 = 40.\]

\[x + 15 = 50\]

\[x = 50 - 15\]

\[x = 35.\]

\[Проверка.\]

\[35 + 15 = 50\]

\[50 = 50.\]

\[5 + x = 60\]

\[x = 60 - 5\]

\[x = 55.\]

\[Проверка.\]

\[5 + 55 = 60\]

\[60 = 60.\]

\[22 + x = 66\]

\[x = 66 - 22\]

\[x = 44.\]

\[Проверка.\]

\[22 + 44 = 66\]

\[66 = 66.\]

\[x + 2 = 88\]

\[x = 88 - 2\]

\[x = 86.\]

\[Проверка.\]

\[86 + 2 = 88\]

\[88 = 88.\]