Odpowiedź:
[tex]a) \: \: 1 \frac{2}{5} + \frac{1}{3} = \frac{7}{5} + \frac{1}{3} = \frac{21}{15} + \frac{5}{15} = \frac{26}{15} = \frac{31}{15} = 2 \frac{1}{15} [/tex]
[tex]b) \: \: 2 \frac{3}{8} - \frac{5}{7} = \frac{19}{8} - \frac{5}{7} = \frac{133}{56} - \frac{40}{56} = \frac{93}{56} = 1 \frac{37}{56} [/tex]
[tex]c) \: \: 1 \frac{3}{5} \times \frac{5}{8} = \frac{8}{ 5} \times \frac{5}{8} = 1[/tex]
[tex]d) \: \: 2 \frac{1}{3} \div 1 \frac{5}{6} = \frac{7}{3} \div \frac{11}{6} = \frac{7}{3} \times \frac{6}{11} = \frac{14}{11} = 1 \frac{3}{11} [/tex]
