a)
[tex]1 \frac{5}{7} + \frac{4}{7} = 1 \frac{9}{7} = 2 \frac{2}{7} [/tex]
b)
[tex]2 \frac{2}{3} + 1 \frac{1}{5} = 2 \frac{10}{15} + 1 \frac{3}{15} = 3 \frac{13}{15} [/tex]
c)
[tex]1 \frac{4}{13} - \frac{9}{13} = \frac{17}{13} - \frac{9}{13} = \frac{8}{13} [/tex]
d)
[tex]6 \frac{8}{9} - 4 \frac{2}{3} = 6 \frac{8}{9} - 4 \frac{6}{9} = 2 \frac{2}{9} [/tex]
Myślę że pomogłem ;)
