Odpowiedź:
[tex] - \frac{13}{15} + \frac{2}{3} = - \frac{13}{15} + \frac{10}{15} = - \frac{3}{15} = - \frac{1}{5} [/tex]
[tex] \frac{181}{5} + \frac{75}{6} = 36 \frac{1}{5} + 12 \frac{3}{6} = 36 \frac{6}{30} + 12 \frac{15}{30 } = 48 \frac{21}{30} [/tex]
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