Răspuns :
[tex]\it (-2\sqrt{3} ) \cdot (-\frac{\sqrt{3} }{2} ) = \frac{2\sqrt{9} }{2} = \sqrt{9} = 3 \\ \\ \it (-) \cdot (-) = +[/tex]
[tex]\it (-2\sqrt{3} ) \cdot (-\frac{\sqrt{3} }{2} ) = \frac{2\sqrt{9} }{2} = \sqrt{9} = 3 \\ \\ \it (-) \cdot (-) = +[/tex]