ГДЗ по математике 5 класс Ерина рабочая тетрадь Часть 1, 2 Часть 1 | Страница 55

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\[\boxed{\mathbf{8.\ }}\]

\[\textbf{а)}\ 13x + 16x = (13 + 16)x =\]

\[= 29x\]

\[\textbf{б)}\ 3b + 8b = (3 + 8)b = 11b\]

\[\textbf{в)}\ a + a + a = (1 + 1 + 1)a =\]

\[= 3a\]

\[\textbf{г)}\ 48p - 27p = (48 - 27)p =\]

\[= 21p\]

\[\textbf{д)}\ 20x + x = (20 + 1)x = 21x\]

\[\textbf{е)}13a + 5a - a =\]

\[= (13 + 5 - 1)a = 17a\]

\[\boxed{\mathbf{9.\ }}\]

\[\textbf{а)}\ 8x + 8x = 320\ \]

\[16x = 320\]

\[x = 320\ :16\]

\[x = 20\]

\[Ответ:20.\]

\[\textbf{б)}\ 10a - a = 810\]

\[9a = 810\]

\[a = 810\ :9\]

\[a = 90\]

\[Ответ:90.\]

\[\textbf{в)}\ 5t + 4t + t = 720\]

\[10t = 720\]

\[t = 720\ :10\]

\[t = 72\]

\[Ответ:72.\]

\[\textbf{г)}\ 15b + 6b - b = 400\]

\[20b = 400\]

\[b = 400\ :20\]

\[b = 20\]

\[Ответ:20.\]

\[\boxed{\mathbf{10.\ }}\]

\[\textbf{а)}\ x = 37:\ \ \ \ \ \ \ \ \]

\[7x + 9x + 4x = (7 + 9 + 4)x =\]

\[= 20 \cdot x = 20 \cdot 37 = 740.\]

\[\textbf{б)}\ x = 7:\]

\[24x + 9x - 22x + 23 =\]

\[= (24 + 9 - 22)x + 23 =\]

\[= 11 \cdot x + 23 = 11 \cdot 7 + 23 =\]

\[= 77 + 23 = 100.\]