[tex]a)\\\\\frac{1}{6}+\frac{2}{5}=\frac{5}{30}+\frac{12}{30}=\frac{17}{30}\\\\b)\\\\\frac{8}{9}-\frac{5}{6}=\frac{16}{18}-\frac{15}{18}=\frac{1}{18}\\\\c)\\\\1\frac{1}{5}+8\frac{1}{7}=1\frac{7}{35}+8\frac{5}{35}=9\frac{12}{35}\\\\d)\\\\4\frac{7}{10}-2\frac{1}{3}=4\frac{21}{30}-2\frac{10}{30}=2\frac{11}{30}[/tex]
[tex]e)\\\\ 4\frac{1}{5}-\frac{7}{10}= 4\frac{2}{10}-\frac{7}{10}= 3\frac{12}{10}-\frac{7}{10}=3\frac{5}{10}=3\frac{1}{2}\\\\f)\\\\6\frac{1}{8}-2\frac{3}{4}=6\frac{2}{16}-2\frac{12}{16}=5\frac{18}{16}-2\frac{12}{16}=3\frac{6}{16}=3\frac{3}{8}\\\\g)\\\\10\frac{2}{3}-6\frac{7}{9}=10\frac{12}{18}-6\frac{14}{18}=9\frac{30}{18}-6\frac{14}{18}=3\frac{16}{18}=3\frac{8}{9}\\\\h)\\\\9\frac{3}{8}-2\frac{5}{6}=9\frac{9}{24}-2\frac{20}{24}=8\frac{33}{24}-2\frac{20}{24}=6\frac{13}{24}[/tex]
[tex]Aby\ dodac\ lub\ odjac\ ulamki\ o\ roznych\ mianownikach,\\nalezy\ je\ sprowadzic\ do\ wspolnego\ mianownika.[/tex]
