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Вычисли произведение дробей:

а) \(\cfrac{1}{2}\cdot \left(-\cfrac{3}{5}\right)=\) [ ];

б) \(-\cfrac{1}{3}\cdot \cfrac{2}{7}=\) [ ];

в) \(-\cfrac{3}{5}\cdot \left(-\cfrac{2}{3}\right)=\) [ ];

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

д) \(\cfrac{5}{6}\cdot \left(-\cfrac{2}{7}\right)=\) [ ];

е) \(-\cfrac{13}{24}\cdot \cfrac{9}{26}=\) [ ];

ж) \(-\cfrac{7}{8}\cdot \left(-\cfrac{11}{14}\right)=\) [ ];

з) \(\cfrac{14}{33}\cdot \cfrac{11}{21}=\) [ ];

и) \(\cfrac{9}{25}\cdot \left(-\dfrac{5}{36}\right)=\) [ ];

к) \(-\cfrac{25}{27}\cdot \cfrac{36}{55}=\) [ ].