Witam.
[tex]a) \: \frac{1}{3} + \frac{1}{2} = \frac{2}{6} + \frac{3}{6} = \frac{5}{6} [/tex]
[tex]b) \: \frac{3}{4} - \frac{2}{5} = \frac{15}{20} - \frac{8}{20} = \frac{7}{20} [/tex]
[tex]c) \: \frac{5}{8} + \frac{1}{7} = \frac{35}{56} + \frac{8}{56} = \frac{43}{56} [/tex]
[tex]d) \: \frac{5}{6} - \frac{3}{7} = \frac{35}{42} - \frac{18}{42} = \frac{17}{42} [/tex]
[tex]e) \: \frac{2}{7} + \frac{1}{5} = \frac{10}{35} + \frac{7}{35} = \frac{17}{35} [/tex]
[tex]f) \: \frac{7}{8} - \frac{2}{3} = \frac{21}{24} - \frac{16}{24} = \frac{5}{24} [/tex]
[tex]g) \: \frac{1}{9} + \frac{1}{7} = \frac{7}{63} + \frac{9}{63} = \frac{16}{63} [/tex]
[tex]h) \: \frac{3}{5} - \frac{1}{3} = \frac{9}{15} - \frac{5}{15} = \frac{4}{15} [/tex]
[tex]i) \: \frac{7}{9} - \frac{3}{4} = \frac{28}{36} - \frac{27}{36} = \frac{1}{36} [/tex]
Pozdrawiam,
Michał
