Заполни пропуски

а) \(\cfrac{2}{5}\cdot \left(-\cfrac{1}{3}\right)=-\cfrac{2}{15}\) ;

\(-\cfrac{2}{15}:\left(-\cfrac{1}{3}\right)=\) [ ];

\(-\cfrac{2}{15}:\cfrac{2}{5}=\) [ ].

б) \(-\cfrac{1}{15}\cdot \cfrac{3}{2}=-\cfrac{1}{10}\) ;

\(-\cfrac{1}{10}:\cfrac{3}{2}=\) [ ];

\(-\cfrac{1}{10}:\left(-\cfrac{1}{15}\right)=\) [ ].

в) \(-\cfrac{4}{15}\cdot \cfrac{3}{4}=-\cfrac{1}{5}\) ;

\(-\cfrac{1}{5}:\cfrac{3}{4}=\) [ ];

\(-\cfrac{1}{5}:\left(-\cfrac{4}{15}\right)=\) [ ].