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Вычисли произведения:

а) \(\cfrac{3}{7}\cdot \left(-\cfrac{7}{3}\right)=\) [ ];

б) \(-\cfrac{4}{3}\cdot \cfrac{3}{4}=\) [ ];

в) \(-\cfrac{8}{5}\cdot \left(-\cfrac{5}{8}\right)=\) [ ];

г) \(\cfrac{3}{10}\cdot \cfrac{5}{12}=\) [ ];

д) \(\cfrac{5}{6}\cdot \left(-\cfrac{6}{5}\right)=\) [ ];

е) \(-\cfrac{17}{24}\cdot \cfrac{24}{17}=\) [ ];

ж) \(-\cfrac{14}{13}\cdot \left(-\cfrac{13}{14}\right)=\) [ ];

з) \(\cfrac{14}{23}\cdot \cfrac{23}{14}=\) [ ];

и) \(\cfrac{9}{25}\cdot \left(-\cfrac{5}{9}\right)=\) [ ];

к) \(-\cfrac{25}{36}\cdot \cfrac{36}{55}=\) [ ];

л) \(-\cfrac{5}{12}\cdot \cfrac{24}{5}=\) [ ];

м) \(-\cfrac{2}{7}\cdot \cfrac{21}{2}=\) [ ].