Решебник по математике 6 класс Мерзляк ФГОС Задание 452

 

\[\boxed{\mathbf{452\ (452).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]

\[1)\ \frac{2}{7}x = \frac{9}{14}\]

\[x = \frac{9}{14}\ :\frac{2}{7}\]

\[x = \frac{9}{14} \cdot \frac{7}{2}\]

\[x = \frac{9}{4}\]

\[x = 2\frac{1}{4}\]

\[Ответ:2\frac{1}{4}.\]

\[2)\ \frac{3}{8}x = 6\]

\[x = 6\ :\frac{3}{8}\]

\[x = 6 \cdot \frac{8}{3}\]

\[x = 16\]

\[Ответ:16.\]

\[3)\ 3x = \frac{2}{9}\]

\[x = \frac{2}{9}\ :3\]

\[x = \frac{2}{9} \cdot \frac{1}{3}\]

\[x = \frac{2}{9 \cdot 3}\]

\[x = \frac{2}{27}\]

\[Ответ:\frac{2}{27}.\]

\[4)\ x\ :\frac{6}{11} = \frac{3}{7}\]

\[x = \frac{3}{7} \cdot \frac{6}{11}\]

\[x = \frac{3 \cdot 6}{7 \cdot 11}\]

\[x = \frac{18}{77}\]

\[Ответ:\ \frac{18}{77}.\]

\[5)\frac{18}{49}\ :x = \frac{6}{35}\]

\[x = \frac{18}{49}\ :\frac{6}{35}\]

\[x = \frac{18}{49} \cdot \frac{35}{6}\]

\[x = \frac{15}{7}\]

\[x = 2\frac{1}{7}\]

\[Ответ:2\frac{1}{7}.\]

\[6)\ \frac{3}{8}x = 2,4\]

\[x = \frac{24}{10}\ :\frac{3}{8}\]

\[x = \frac{12}{5} \cdot \frac{8}{3}\]

\[x = \frac{32}{5} = 6\frac{2}{5}\]

\[x = 6,4\]

\[Ответ:6,4.\]

\[\boxed{\mathbf{452}.}\]

\[1)\ (3 - 0,6)(4 - 3,18) =\]

\[= 2,4 \cdot 0,82 = 1,968\]

\[2)\ 1,56 \cdot 2,5 + 0,75 \cdot 0,32 =\]

\[= 3,9 + 0,24 = 4,14\]