Решебник по математике 5 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 1 | Страница 41

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\[\boxed{\mathbf{12}.}\]

\[\textbf{а)}\ x = 5256;y = 26:\]

\[(x + 48)\ :y - 97 =\]

\[= (5256 + 48)\ :26 - 97 =\]

\[= 5304\ :26 - 97 =\]

\[= 204 - 97 = 107\]

\[\textbf{б)}\ x = 1732;y = 36:\]

\[(x - 76)\ :y + 85 =\]

\[= (1732 - 76)\ :36 + 85 =\]

\[= 1656\ :36 + 85 =\]

\[= 46 + 85 = 131\]

\[\textbf{в)}\ a = 324;\ \ b = 259:\]

\[a\ :\left( 314 - (b + 19) \right) =\]

\[= 324\ :(314 - (259 + 19) =\]

\[= 324\ :(314 - 278) =\]

\[= 324\ :36 = 9\]

\[\textbf{г)}\ c = 592;\ \ b = 211:\]

\[c\ :\left( 243 - (b - 42) \right) =\]

\[= 592\ :\left( 243 - (211 - 42) \right) =\]

\[= 592\ :(243 - 169) =\]

\[= 592\ :74 = 8\]

\[\boxed{\mathbf{13}.}\]

\[\textbf{а)}\ 16 - a = a + 4\]

\[a + a = 16 - 4\]

\[2a = 12\]

\[a = 12\ :2\]

\[a = 6.\]

\[\textbf{б)}\ 23 - a = a + 17\]

\[a + a = 23 - 17\]

\[2a = 6\]

\[a = 6\ :2\]

\[a = 3.\]

\[\textbf{в)}\ 18 + a = 10 - a\]

\[a + a = 10 - 18\]

\[2a = - 8\]

\[нет\ таких\ \text{a.}\]

\[\textbf{г)}\ a + 11 = 19 - a\]

\[a + a = 19 - 11\]

\[2a = 8\]

\[a = 8\ :2\]

\[a = 4.\]

\[\boxed{\mathbf{14}.}\]

\[\textbf{а)}\ 17 - c > c + 12\]

\[c = 1;2.\]

\[\textbf{б)}\ 4 + c < 11 - c\]

\[c = 1;2;3.\]

\[\textbf{в)}\ 24 - c > 12 + c\]

\[c = 1;2;3;4;5.\]

\[\textbf{г)}\ c + 8 < 16 - c\]

\[c = 1;2;3.\]