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Приведи дроби к общему положительному знаменателю:

a) \(\cfrac{^{3/}-11}{12}=\cfrac{-33}{36}\) , \(\cfrac{^{-2/}17}{-18}=\cfrac{-34}{36}\) ;

б) \(\cfrac{-4}{15}=\) [ ], \(\cfrac{7}{-30}=\) [ ];

в) \(\cfrac{3}{8}=\) [ ], \(\cfrac{-5}{12}=\) [ ];

г) \(\cfrac{3}{-7}=\) [ ], \(\cfrac{5}{14}=\) [ ];

д) \(\cfrac{1}{2}=\) [ ], \(\cfrac{-5}{7}=\) [ ];

е) \(\cfrac{4}{15}=\) [ ], \(\cfrac{7}{-25}=\) [ ].