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Вычиcли разноcть дробей c одинаковыми знаменателями:

а) \(\cfrac{1}{4}-\cfrac{3}{4}=\) [ ];

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

в) \(-\cfrac{1}{4}-\cfrac{3}{4}=\) [ ];

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

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

е) \(-\cfrac{5}{9}-\left(-\cfrac{1}{9}\right)=\) [ ];

ж) \(-\cfrac{1}{13}-\cfrac{12}{13}=\) [ ];

з) \(\cfrac{1}{21}-\cfrac{2}{21}=\) [ ];

и) \(\cfrac{3}{10}-\cfrac{3}{10}=\) [ ];

к) \(\cfrac{11}{14}-\left(-\dfrac{1}{14}\right)=\) [ ].