a)
[tex] \frac{2}{3} + \frac{6}{7} = \frac{14}{21} + \frac{18}{21} = \frac{32}{21} = 1 \frac{11}{21} [/tex]
[tex] \frac{7}{8} + \frac{5}{6} = \frac{21}{24} + \frac{20}{24} = \frac{41}{24} = 1 \frac{17}{24} [/tex]
b)
[tex]5 \frac{1}{4} + \frac{5}{6} = 5 \frac{3}{12} + \frac{10}{12} = 5 \frac{13}{12} = 6 \frac{1}{12} [/tex]
[tex]1 \frac{7}{9} + 2 \frac{3}{10} = 1 \frac{70}{90} + 2 \frac{27}{90} = 3 \frac{97}{90} = 4 \frac{7}{90} [/tex]
[tex]2 \frac{7}{8} + 3 \frac{1}{6} = 2 \frac{21}{24} + 3 \frac{4}{24} = 5 \frac{25}{24} = 6 \frac{1}{24} [/tex]
Myślę że pomogłem ;)
