Răspuns:
[tex]3\frac{1}{2} = \frac{6+1}{2} = \frac{7}{2}[/tex]
[tex]1\frac{1}{3} = \frac{3+1}{3} = \frac{4}{3}[/tex]
[tex](\frac{7}{2} -\frac{1}{2} )+(\frac{4}{3} -\frac{1}{3} ) = \frac{7-1}{2} +\frac{4-1}{3} = \frac{6}{2} +\frac{3}{3} =3+1=4[/tex]
