Odpowiedź:
A)
[tex] \frac{4}{5} l + \frac{3}{5} l + \frac{4}{5} l = \frac{7}{5} l + \frac{4}{5} l = \frac{11}{5} l = 2 \frac{1}{5} l[/tex]
B)
[tex]1 \frac{1}{4} l + 1 \frac{2}{4} l = \frac{5}{4} l + \frac{6}{4} l = \frac{11}{4} l = 2 \frac{3}{4} l[/tex]
