Odpowiedź:
[tex]14 \frac{5}{9} + 7 \frac{2}{5} = 14 \frac{25}{45} + 7 \frac{18}{45} = 21 \frac{43}{45} [/tex]
[tex]13 - 9 \frac{7}{18} = 3 \frac{11}{18} [/tex]
[tex]7 \frac{7}{9} - \frac{5}{6} = 7 \frac{14}{18} - \frac{15}{18} = 6 \frac{17}{18} [/tex]
[tex]23 \frac{5}{7} - 8 \frac{3}{4} = 23 \frac{20}{28} - 8 \frac{21}{28} = 14 \frac{27}{28} [/tex]
