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Сложи дроби:

а) \(\cfrac{3}{4}+\cfrac{5}{4}=\cfrac{3+5}{4}=\cfrac{8}{4}=2\) ;

б) \(\cfrac{-11}{21}+\cfrac{10}{21}=\cfrac{-11+10}{21}=\cfrac{-1}{21}\) ;

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

г) \(\cfrac{4}{7}+\cfrac{-1}{7}=\) [ ];

д) \(\cfrac{-3}{8}+\cfrac{-1}{2}=\) [ ];

е) \(\cfrac{-5}{12}+\cfrac{1}{6}=\) [ ]:

ж) \(\cfrac{7}{9}+\cfrac{-1}{2}=\) [ ];

з) \(\cfrac{2}{7}+\cfrac{1}{4}=\) [ ];

и) \(\cfrac{-3}{26}+\cfrac{2}{39}=\) [ ];

к) \(\cfrac{-1}{16}+\cfrac{-5}{24}=\) [ ].