ГДЗ по математике 5 класс Мерзляк ФГОС Задание 975

\[\boxed{\ \mathbf{975\ (975)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ 3,2\ :0,4 = 32\ :4 = 8\]

\[2)\ 0,36\ :0,9 = 36\ :90 = 0,4\]

\[3)\ 0,084\ :0,04 = 84\ :40 = 2,1\]

\[4)\ 0,012\ :0,6 = 12\ :600 = 0,02\]

\[5)\ 2,4\ :0,12 = 240\ :12 = 20\]

\[6)\ 0,3248\ :0,016 =\]

\[= 3248\ :160 = 20,3\]

\[\boxed{\mathbf{975}\mathbf{.}\mathbf{\ }}\]

\[\frac{b \cdot 3}{4 \cdot 3} = \frac{3b}{12}\text{\ \ \ \ \ }\]

\[\frac{3b}{12} = \frac{21}{a}\ \]

\[a = 12.\ \ \ \]

\[3b = 21\]

\[b = 21\ :3\]

\[b = 7.\]

\[Ответ:x = 12;b = 7.\]