Запиши ответы

Выполни деление дробей и сделай проверку умножением.

а) \(-\cfrac{9}{10}:\cfrac{4}{7}=-\left(\cfrac{9\cdot 7}{10\cdot 4}\right)=-\cfrac{63}{40}\) ,

\(-\cfrac{63}{40}\cdot \cfrac{4}{7}=-\left(\cfrac{63\cdot 4}{40\cdot 7}\right)=-\cfrac{9}{10}\) ;

б) \(-\cfrac{3}{4}:\left(\cfrac{7}{8}\right)=\) [ ] \(=\) [ ],

[ ] \(=\) [ ] \(=\) [ ];

в) \(\cfrac{1}{4}:\left(-\cfrac{9}{10}\right)=\) [ ] \(=\) [ ],

[ ] \(=\) [ ] \(=\) [ ];

г) \(-\cfrac{3}{5}:\left(-\cfrac{4}{11}\right)=\) [ ] \(=\) [ ],

[ ] \(=\) [ ] \(=\) [ ].