Am atasat Exercitiul complet
[tex]\frac{2}{9} +\frac{1}{9}=\frac{3}{9} \\\\\frac{1}{9} +\frac{3}{9}=\frac{4}{9} \\\\\frac{3}{9} +\frac{4}{9}=\frac{7}{9}[/tex]
[tex]\frac{4}{6} -\frac{3}{6} =\frac{1}{6} \\\\1-\frac{4}{6} =\frac{2}{6} \\\\\frac{2}{6} -\frac{1}{6} =\frac{1}{6}[/tex]
[tex]\frac{10}{9} -\frac{5}{9} =\frac{5}{9} \\\\\frac{5}{9} -\frac{3}{9}=\frac{2}{9} \\\\\frac{2}{9}+\frac{4}{9} =\frac{6}{9} \\\\\frac{6}{9} +\frac{5}{9} =\frac{11}{9} \\\\\frac{10}{9} +\frac{11}{9} =\frac{21}{9}[/tex]