Odpowiedź:
b)
[tex] \frac{6}{15} + \frac{5}{15 } = \frac{11}{15} [/tex]
c)
[tex] \frac{9}{12} - \frac{8}{12} = \frac{1}{12} [/tex]
d)
[tex]4 \frac{3}{18} + 2 \frac{14}{18} = 6 \frac{17}{18} [/tex]
c)
[tex]5 \frac{5}{20} - 4 \frac{14}{20} = \frac{11}{20} [/tex]
