Cześć!
Szczegółowe wyjaśnienie:
[tex]a) \: \frac{7}{10} + \frac{5}{10} = \frac{7 + 5}{10} = \frac{12}{10} = \frac{6}{5} = 1 \frac{1}{5} [/tex]
[tex]b) \: 2 \frac{4}{7} + 11 \frac{5}{7 } = (2 + 11) + ( \frac{4}{7} + \frac{5}{7} ) = 13 + \frac{9}{7} = 13 + 1 \frac{2}{7} = 13 + 1 + \frac{2}{7} = 14 \frac{2}{7} [/tex]
[tex]c) \: 2 \frac{2}{5} + 5 \frac{3}{5} = (2 + 5) + ( \frac{2}{5} + \frac{3}{5} ) = 7 + 1 = 8[/tex]
