Odpowiedź:
a) [tex]\frac{7}{9} + \frac{4}{5} = \frac{35}{45} + \frac{36}{45} = \frac{71}{45} = 1\frac{21}{45}[/tex]
b) [tex]\frac{4}{5} + \frac{5}{8} = \frac{32}{40} + \frac{25}{40} = \frac{57}{40} = 1\frac{17}{40}[/tex]
c) [tex]\frac{5}{7} - \frac{1}{6} = \frac{30}{42} - \frac{7}{42} = \frac{23}{42}[/tex]
d) [tex]\frac{2}{3} - \frac{1}{10} = \frac{20}{30} - \frac{3}{30} = \frac{17}{30}[/tex]
e) [tex]\frac{1}{6} + \frac{6}{7} = \frac{7}{42} + \frac{36}{42} = \frac{43}{42} = 1\frac{1}{42}[/tex]
f) [tex]\frac{3}{4} + \frac{4}{5} = \frac{15}{20} + \frac{16}{20} = \frac{31}{20} = 1\frac{11}{20}[/tex]
g) [tex]\frac{5}{6} + \frac{5}{7} = \frac{35}{42} + \frac{30}{42} = \frac{65}{42} = 1\frac{23}{42}[/tex]
h) [tex]\frac{10}{11} - \frac{1}{2} = \frac{20}{22} - \frac{11}{22} = \frac{9}{22}[/tex]
i) [tex]\frac{2}{3} - \frac{2}{7} = \frac{14}{21} - \frac{6}{21} = \frac{8}{21}[/tex]
