Răspuns :
[tex] \frac{1}{1} + \frac{1}{2} + \frac{1}{3} + \frac{1}{4} - \frac{5}{12} amplificam \\ \frac{12}{12} + \frac{6}{12} + \frac{4}{12} + \frac{3}{12} - \frac{5}{12} = \frac{20}{12} = \frac{5}{3} =1,6[/tex]
[tex]\displaystyle 1+ \frac{1}{2} + \frac{1}{3} + \frac{1}{4} - \frac{5}{12} = \frac{12+6+4+3-5}{12} = \frac{20}{12} ^{(4} = \frac{5}{3} [/tex]
