Cześć!
Szczegółowe wyjaśnienie:
a)
[tex] 2\frac{2}{3} + \frac{11}{5} = \frac{8}{3} + \frac{11}{5} = \frac{73}{15} = 4 \frac{13}{15} [/tex]
b)
[tex]1 \frac{4}{13} - \frac{9}{13} = \frac{17}{13} - \frac{9}{13} = \frac{8}{13} [/tex]
c)
[tex]6 \frac{8}{9} - 4 \frac{2}{3} = (6 - 4) + ( \frac{8}{9} - \frac{2}{3} ) = 2 + \frac{2}{9} = 2 \frac{2}{6} [/tex]
