Выбери верные ответы

Определи знак произведения.

1. \(\cfrac{1}{2}\cdot \cfrac{3}{4}\) ;
   [ \(+\) | \(-\) ].
2. \(\cfrac{-1}{2}\cdot \cfrac{3}{4}\) ;
   [ \(+\) | \(-\) ].
3. \(\cfrac{-1}{2}\cdot \cfrac{-3}{4}\) ;
   [ \(+\) | \(-\) ].
4. \(\left(-\cfrac{1}{2}\right)\cdot \left(-\cfrac{3}{4}\right)\) ;
   [ \(+\) | \(-\) ].
5. \(\cfrac{1}{2}\cdot \left(-\cfrac{3}{4}\right)\) ;
   [ \(+\) | \(-\) ].
6. \(\left(-\cfrac{1}{2}\right)\cdot \cfrac{3}{4}\) ;
   [ \(+\) | \(-\) ].