\[\boxed{\ \mathbf{971\ (971)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\(1)\ x \cdot 13 = 13,26\)
\[x = 13,26\ :13\]
\[x = 1,02\]
\[Ответ:1,02.\]
\[2)\ 64,6\ :x = 17\]
\[x = 64,6\ :17\]
\[x = 3,8\]
\[Ответ:3,8.\]
\[3)\ x\ :14,5 = 4,6\]
\[x = 14,5 \cdot 14,6\]
\[x = 66,7\]
\[Ответ:66,7.\]
\[4)\ 9,728x + 7,272x = 4,08\]
\[17x = 4,08\]
\[x = 4,08\ :17\]
\[x = 0,24\]
\[Ответ:0,24.\]
\[5)\ 38,6x - 16,6x = 14,74\]
\[22x = 14,74\]
\[x = 14,74\ :22\]
\[x = 0,67\]
\[Ответ:0,67.\]
\[6)\ 1,2x + 4,6x - 2,8x = 0,15\]
\[3x = 0,15\]
\[x = 0,15\ :3\]
\[x = 0,05\]
\[Ответ:0,05.\]
\[\boxed{\mathbf{971}\mathbf{.}\mathbf{\ }}\]
\[Неправильные\ несократимые\ \]
\[дроби\ с\ числителем\ 20:\]
\[\frac{20}{1};\ \frac{20}{3};\ \frac{20}{7};\ \frac{20}{9}.\]