Решебник по математике 6 класс Мерзляк ФГОС Задание 131

 

\[\boxed{\mathbf{131\ (131).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 4x + 5x + 4,7 = 16,4\]

\[9x = 16,4 - 4,7\]

\[9x = 11,7\]

\[x = 11,7\ :9\]

\[x = 117\ :90\]

\[x = 1,3\]

\[Ответ:1,3.\]

\[2)\ 0,7x - 0,4x + 46 = 211\]

\[0,3x = 211 - 46\]

\[0,3x = 165\]

\[x = 165\ :0,3\]

\[x = 1650\ :3\]

\[x = 550\]

\[Ответ:550.\]

\[3)\ (35,8 - x)\ :2,1 = 1,3\]

\[35,8 - x = 1,3 \cdot 2,1\]

\[35,8 - x = 2,73\]

\[x = 35,8 - 2,73\]

\[x = 33,07\]

\[Ответ:33,07.\]

\[4)\ 0,9 \cdot (283 - x) = 17,01\]

\[283 - x = 17,01\ :0,9\]

\[283 - x = 1701\ :90\]

\[283 - x = 18,9\]

\[x = 283 - 18,9\]

\[x = 264,1\]

\[Ответ:264,1.\]

\[\boxed{\mathbf{131}.}\]

\[1)\ 18\ и\ 27 \]

\[2)\ 22\ и\ 33\]

\[3)\ 36\ и\ 48\]

\[4)\ 45\ и\ 49\]

\[5)\ 15\ и\ 60\]

\[НОД(15;60) = 15.\]

\[6)\ 9;15;18.\]