Решебник по математике 5 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 1 | Страница 47

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\[\textbf{а)}\ (a + 46) + 77 = 184\]

\[a + 46 = 184 - 77\]

\[a + 46 = 107\]

\[a = 107 - 46\]

\[a = 61.\]

\[(a + 46) + 77 = 184\]

\[a + 46 + 77 = 184\]

\[a + 123 = 184\]

\[a = 184 - 123\]

\[a = 61.\]

\[\textbf{б)}\ (45 + x) - 16 = 51\]

\[45 + x = 51 + 16\]

\[45 + x = 67\]

\[x = 67 - 45\]

\[x = 22.\]

\[(45 + x) - 16 = 51\]

\[(45 - 16) + x = 51\]

\[29 + x = 51\]

\[x = 51 - 29\]

\[x = 22.\]

\[\textbf{в)}\ 86 + (42 - y) = 104\]

\[42 - y = 104 - 86\]

\[42 - y = 18\]

\[y = 42 - 18\]

\[y = 24.\ \]

\[86 + (42 - y) = 104\]

\[(86 + 42) - y = 104\]

\[128 - y = 104\]

\[y = 128 - 104\]

\[y = 24.\]