Odpowiedź:
[tex]2 \frac{4}{7} + 1 \frac{2}{9} = 2 \frac{36}{63} + 1 \frac{14}{63} = 3 \frac{50}{63} \\ 4 \frac{1}{9} - 1 \frac{3}{7} = 4 \frac{7}{63} - 1 \frac{27}{63} = 2 \frac{43}{63} \\ 3 \frac{2}{9} - 2 \frac{5}{7} = 3 \frac{14}{63} - 2 \frac{45}{63} = \frac{32}{63} [/tex]
[tex]3 \frac{5}{6} - 2 \frac{5}{7} = 3 \frac{35}{42} - 2 \frac{30}{42} = 1 \frac{5}{42} \\ 1 \frac{1}{6} + 2 \frac{3}{7} = 1 \frac{7}{42} + 2 \frac{18}{42} = 3 \frac{25}{42} \\ 3 \frac{5}{8} - 2 \frac{5}{7} = 3 \frac{35}{56} - 2 \frac{40}{56} = \frac{51}{56} [/tex]
[tex]1 \frac{3}{8} + 2 \frac{4}{7} = 1 \frac{21}{56} + 2 \frac{32}{56} = 3 \frac{53}{56} \\ 4 \frac{6}{8} - 1 \frac{6}{7} = 4 \frac{42}{56} - 1 \frac{48}{56} = 2 \frac{50}{56} \\ 3 \frac{1}{7} - 2 \frac{3}{8} = 3 \frac{8}{56} - 2 \frac{21}{56} = \frac{43}{56}[/tex]
[tex]3 \frac{5}{8} - 2 \frac{5}{7} = 3 \frac{35}{56} - 2 \frac{40}{56} = \frac{51}{56} \\ [/tex]
