Odpowiedź :
[tex]5 - 1 \frac{3}{11} = \frac{55}{11} - \frac{14}{11} = \frac{41}{11} = 3\frac{8}{11}[/tex]
[tex]5*\frac{3}{8}=\frac{15}{8}=1\frac{7}{8} \\\\12\frac{5}{7} - 4\frac{4}{7} = \frac{89}{7} - \frac{32}{7} = \frac{57}{7} = 8\frac{1}{7}[/tex]