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Вычисли сумму дробей с разными знаками:

а) \(\cfrac{1}{7} +\left(-\cfrac{4}{7}\right)=-\left(\cfrac{4}{7}-\cfrac{1}{7} \right)=-\cfrac{3}{7}\) ;

б) \(-\cfrac{4}{13}+\cfrac{11}{13}=\) [ ];

в) \(\cfrac{3}{8}+\left(-\cfrac{1}{4}\right)=\) [ ];

г) \(-\cfrac{9}{14}+\cfrac{5}{14}=\) [ ];

д) \(\cfrac{7}{9}+\left(-\cfrac{5}{18}\right)=\) [ ];

е) \(-\cfrac{11}{24}+\cfrac{5}{12}=\) [ ];

ж) \(\cfrac{3}{4}+\left(-\cfrac{4}{5}\right)=\) [ ];

з) \(-\cfrac{6}{7}+\cfrac{7}{8}=\) [ ];

и) \(\dfrac{5}{24}+\left(-\dfrac{11}{36}\right)=\) [ ];

к) \(-\cfrac{1}{27}+\cfrac{13}{36}=\) [ ].