ГДЗ по математике 5 класс Ткачева ФГОС рабочая тетрадь Часть 1, 2 Часть 1 | Страница 30

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

\[\textbf{а)}\]

\[\textbf{б)}\]

\[\boxed{\mathbf{6}.}\]

\[\textbf{а)}\ 7 \cdot x - 46 = 38\]

\[7 \cdot x = 38 + 46\]

\[7 \cdot x = 84\]

\[x = 84\ :7\]

\[x = 12.\]

\[\textbf{б)}\ 300\ :(51 - y) = 15\]

\[51 - y = 300\ :15\]

\[51 - y = 20\]

\[y = 51 - 20\]

\[y = 31.\]

\[\textbf{в)}\ 108 - 9 \cdot y = 36\]

\[9 \cdot y = 108 - 36\]

\[9 \cdot y = 72\]

\[y = 72\ :9\]

\[y = 8.\]

\[\textbf{г)}\ 220\ :(13 + x) = 11\]

\[13 + x = 220\ :11\]

\[13 + x = 22\]

\[x = 22 - 13\]

\[x = 9.\]