Odpowiedź:
a)[tex]2\frac{4}{5}[/tex] + [tex]\frac{3}{5}[/tex] = [tex]\frac{14}{5}[/tex] + [tex]\frac{3}{5}[/tex] = [tex]\frac{17}{5}[/tex] = [tex]3\frac{2}{5}[/tex]
b) [tex]3\frac{2}{7} - \frac{6}{7} = \frac{23}{7} - \frac{6}{7} = \frac{17}{7} = 2\frac{3}{7}[/tex]
