6.
[tex] \frac{3}{7} + \frac{2}{7} = \frac{5}{7} [/tex]
[tex]1 \frac{4}{6} - \frac{5}{6} = \frac{10}{6} - \frac{5}{6} = \frac{5}{6} [/tex]
w okienku będzie[tex] - \frac{5}{6} [/tex]
[tex]4 \frac{1}{5} - \frac{4}{5} = \frac{21}{5} - \frac{4}{5} = \frac{17}{5} = 3\frac{2}{5} [/tex]
w okienku będzie[tex] - \frac{4}{5} [/tex]
7.
[tex]7 \frac{1}{5} - 4 \frac{3}{5} = \frac{36}{5} - \frac{23}{5} = \frac{13}{5} = 2 \frac{3}{5} [/tex]
Spr.
[tex]4 \frac{3}{5} + 2 \frac{3}{5} = 6 \frac{6}{5} = 7 \frac{1}{5} [/tex]
[tex]5 \frac{2}{7} - 3 \frac{5}{7} = \frac{37}{7} - \frac{26}{7} = \frac{11}{7} = 1 \frac{4}{7} [/tex]
Spr.
[tex]3 \frac{5}{7} + 1\frac{4}{7} = 4 \frac{9}{7} = 5 \frac{2}{7} [/tex]
