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7supra12+1supra4+2supra3

Răspuns :

 7+3+8 totul supra 12= 3 supra 2 
   
[tex]\displaystyle \frac{7}{12} + \frac{1}{4} + \frac{2}{3} =\frac{7}{12} + \frac{3}{12} + \frac{8}{12} =\frac{7+3+8}{12}= \frac{18}{12}= \boxed{\frac{3}{2}}[/tex]