Răspuns: √6
[tex]\displaystyle \frac{12}{2\sqrt{6} } \ = \ \frac{12 \ \cdot \ \sqrt{6} }{2\sqrt{6} \ \cdot \sqrt{6} } \ = \ \frac{12 \ \sqrt{6} }{2 \cdot \ 6 } \ = \ \frac{12 \ \sqrt{6} }{12 } \ = \ \sqrt{6}[/tex]
