Odpowiedź:
[tex] \frac{3}{8} - \frac{2 }{12} = \frac{9}{24} - \frac{4}{24} = \frac{5}{24} [/tex]
[tex] \frac{7}{14} - \frac{1}{2} = \frac{7}{14} - \frac{7}{14} = 0[/tex]
[tex] \frac{7}{8} - \frac{1}{9} = \frac{63}{72} - \frac{8}{72} = \frac{55}{72} [/tex]
