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Вычисли сумму отрицательных дробей.

а) \(-\cfrac{1}{5}+\left(-\cfrac{3}{5}\right)=-\left(\cfrac{1}{5}+\cfrac{3}{5}\right)=-\cfrac{4}{5}\) ;

б) \(-\cfrac{5}{11}+\left(-\cfrac{2}{11}\right)=\) [ ] \(=\) [ ];

в) \(-\cfrac{5}{9}+\left(-\cfrac{4}{27}\right)=\) [ ] \(=\) [ ];

г) \(-\cfrac{5}{14}+\left(-\cfrac{2}{7}\right)=\) [ ] \(=\) [ ];

д) \(-\cfrac{7}{5}+\left(-\cfrac{1}{15}\right)=\) [ ] \(=\) [ ];

е) \(-\cfrac{5}{12}+\left(-\cfrac{1}{2}\right)=\) [ ] \(=\) [ ];

ж) \(-\cfrac{2}{3}+\left(-\cfrac{2}{5}\right)=\) [ ] \(=\) [ ];

з) \(-\cfrac{3}{5}+\left(-\cfrac{2}{7}\right)=\) [ ] \(=\) [ ];

и) \(-\cfrac{9}{10}+\left(-\cfrac{2}{15}\right)=\) [ ] \(=\) [ ];

к) \(-\cfrac{1}{14}+\left(-\cfrac{2}{21}\right)=\) [ ] \(=\) [ ].