Odpowiedź:
a)
[tex] = \frac{4}{12} + \frac{3}{12} = \frac{7}{12} [/tex]
b)
[tex] = \frac{3}{4} - \frac{4}{7} = \frac{21}{28} - \frac{16}{28} = \frac{5}{28} [/tex]
c)
[tex] = \frac{13}{3} \div \frac{13}{50} = \frac{13}{3} \times \frac{50}{13} = \frac{50}{3} = 16 \frac{2}{3} [/tex]
d)
[tex]3 \frac{3}{5} \times 1 \frac{7}{9} = \frac{18}{5} \times \frac{16}{9} = \frac{32}{5} = 6 \frac{2}{5} [/tex]