Решебник по математике 5 класс Мерзляк ФГОС Задание 492

 

\[\boxed{\ \mathbf{492\ (492)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 9b + 6b - 15 = 615\]

\[15b = 615 + 15\]

\[15\ b = 630\]

\[b = 630\ :15\]

\[b = 42\]

\[Ответ:42.\]

\[2)\ 2a + 123a + 97 = 472\]

\[125a = 472 - 97\]

\[125a = 375\]

\[a = 375\ :125\]

\[a = 3\]

\[Ответ:375.\]

\[3)\ 17x - x + 5x - 19 = 170\]

\[21x = 170 + 19\]

\[21x = 189\]

\[x = 189\ :21\]

\[x = 9\]

\[Ответ:9.\]

\[4)\ 73y - y - 22y + 40 = 190\]

\[50y = 190 - 40\]

\[50y = 150\]

\[y = 150\ :50\]

\[y = 3\]

\[Ответ:3.\]

\[\boxed{\ \mathbf{492.}}\]

\[1 = 1^{3}\]

\[8 = 2^{3}\]

\[27 = 3^{3}\]

\[1000 = 10^{3}\]