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Вычисли:

а) \(7\cdot \left(-\cfrac{5}{14}\right)=-\left(\cfrac{7\cdot 5}{14}\right)=-\cfrac{5}{2}\) ;

б) \(-8:\left(-\cfrac{4}{5}\right)=\) [ ] \(=\) [ ];

в) \((-9)\cdot \cfrac{5}{81}=\) [ ] \(=\) [ ];

г) \((-15):\cfrac{5}{6}=\) [ ] \(=\) [ ];

д) \(6\cdot \left(-\cfrac{5}{12}\right)=\) [ ] \(=\) [ ];

е) \((-14):\left(-\cfrac{7}{9}\right)=\) [ ] \(=\) [ ].