Odpowiedź:
[tex]17.a) \frac{2}{3} + \frac{2}{9} = \frac{6}{9} + \frac{2}{9} = \frac{8}{9} \\ b) \frac{3}{4} + \frac{5}{12} = \frac{9}{12} + \frac{5}{12} = \frac{14}{12} = 1 \frac{2}{12} = 1 \frac{1}{6} \\ c)2 \frac{1}{3} + 1 \frac{7}{15} = + 1 \frac{7}{15} = 3 \frac{12}{15} = 3 \frac{4}{5} \\ d)1 \frac{3}{5} + 5 \frac{4}{7} = 1 \frac{21}{35} + 5 \frac{20}{35} = 6 \frac{41}{35} = 7 \frac{6}{35} \\ e)4 \frac{9}{14} + 2 \frac{11}{21} = 4 \frac{27}{42} + 2 \frac{22}{42} = 6 \frac{49}{42} = 7 \frac{7}{42} = 7 \frac{1}{6} \\ f)3 \frac{1}{12} + 1 \frac{5}{18} = 3 \frac{3}{36} + 1 \frac{10}{36} = 4 \frac{13}{36} [/tex]