Szczegółowe wyjaśnienie:
[tex]6 \frac{1}{5} - 3 \frac{5}{6} = 5 \frac{36}{30} - 3 \frac{25}{30} = 2 \frac{9}{30} [/tex]
[tex]6\frac{1}{5}+(-3\frac{5}{6}) = 5\frac{36}{30} -3\frac{25}{30} = 2\frac{11}{30}[/tex]
