Odpowiedź:
[tex]a)\ \ \frac{3}{10}+\frac{8}{15}=\frac{9}{30}+\frac{16}{30}=\frac{25}{30}=\frac{5}{6}\\\\b)\ \ \frac{5}{6}-\frac{4}{9}=\frac{15}{18}-\frac{8}{18}=\frac{7}{18}\\\\c)\ \ \frac{3}{8}+\frac{5}{12}=\frac{9}{24}+\frac{10}{24}=\frac{19}{24}\\\\d)\ \ \frac{7}{12}-\frac{4}{15}=\frac{35}{60}-\frac{16}{60}=\frac{19}{60}\\\\e)\ \ \frac{5}{9}+\frac{7}{12}=\frac{20}{36}+\frac{21}{36}=\frac{41}{36}=1\frac{5}{36}\\\\f)\ \ \frac{8}{9}-\frac{7}{15}=\frac{40}{45}-\frac{21}{45}=\frac{19}{45}[/tex]
[tex]g)\ \ \frac{1}{6}+\frac{5}{8}=\frac{4}{24}+\frac{15}{24}=\frac{19}{24}\\\\h)\ \ \frac{17}{20}-\frac{8}{15}=\frac{51}{60}-\frac{32}{60}=\frac{19}{60}\\\\i)\ \ \frac{11}{18}-\frac{5}{12}=\frac{22}{36}-\frac{15}{36}=\frac{7}{36}[/tex]
