Odpowiedź:
[tex]x = 2 \frac{1}{3} \cdot \: \frac{3}{5} - \frac{1}{6} = \frac{7}{3} \cdot \frac{3}{5} - \frac{1}{6} = \frac{7}{5} - \frac{1}{6} = \frac{42}{30} - \frac{7}{30} = \frac{35}{30} = \frac{7}{6} [/tex]
[tex]y = 5 - \frac{2}{3} \div \frac{7}{48} = 5 - \frac{2}{3} \cdot \frac{48}{7} = 5 - \frac{2}{1} \cdot \frac{16}{7} = 5 - \frac{32}{7} = \frac{35}{7} - \frac{32}{7} = \frac{3}{7} [/tex]
[tex] \frac{1}{x} + \frac{1}{y} = \frac{6}{7} + \frac{7}{3} = \frac{18}{21} + \frac{49}{21} = \frac{67}{21} = 3 \frac{4}{21} [/tex]
