Odpowiedź:
[tex]7 \frac{1}{5} - 4 \frac{3}{5} = 6 \frac{6}{5} - 4 \frac{3}{5} = 2 \frac{3}{5} \\ spr. \: 4 \frac{3}{5} + 2 \frac{3}{5} = 6 \frac{6}{5} = 7 \frac{1}{5} \\ \\ 5 \frac{2}{7} - 3 \frac{5}{7} = 4 \frac{9}{7} - 3 \frac{5}{7} = 1 \frac{4}{7} \\ spr. \: \: 3 \frac{5}{7} + 1 \frac{4}{7} = 4 \frac{9}{7} = 5 \frac{2}{7} [/tex]
