[tex]8 - 1\frac{4}{7} = 6 \frac{3}{7} [/tex]
[tex]9 \frac{5}{7} - 1 \frac{4}{7} = 8 \frac{1}{7} [/tex]
[tex]11 \frac{6}{7} - 1 \frac{4}{7} = 10 \frac{2}{7} [/tex]
[tex]18 \frac{1}{7} - 1 \frac{4}{7} = 16 \frac{4}{7} [/tex]
[tex]20 \frac{2}{7} - 1 \frac{4}{7} = 18 \frac{4}{7} [/tex]
[tex]33 \frac{3}{7} - 1 \frac{4}{7} = 31 \frac{4}{7} [/tex]
ostatniego nie jestem pewna
