Решебник по математике 5 класс Мерзляк ФГОС Задание 491

 

\[\boxed{\ \mathbf{491\ (491)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 14x + 4x - 48 = 240\]

\[18x = 240 + 48\]

\[18x = 288\]

\[x = 288\ :18\]

\[x = 16\]

\[Ответ:16.\]

\[2)\ 25b - 7b - 9 = 279\]

\[18b = 279 + 9\]

\[18b = 288\]

\[b = 288\ :18\]

\[b = 16\]

\[Ответ:16.\]

\[3)\ 16a - 7a + 96 = 222\]

\[9a = 222 - 96\]

\[9a = 126\]

\[a = 126\ :9\]

\[a = 14\]

\[Ответ:14.\]

\[4)\ 20y + 5y + y + 19 = 227\]

\[26y = 227 - 19\]

\[26y = 208\]

\[y = 208\ :26\]

\[y = 8\]

\[Ответ:8.\]

\[\boxed{\ \mathbf{491.}}\]

\[16 = 4^{2}\]

\[64 = 8^{2}\]

\[100 = 10^{2}\]

\[900 = 30^{2}\]

\[250\ 000 = 500^{2}\]