a) \( \frac{1}{2} - \frac{1}{5} + \frac{1}{6} = \frac{1 \cdot 15 - 1 \cdot 6 + 1 \cdot 5}{30} = \frac{15-6+5}{30} = \frac{14}{30} = \frac{7}{15} \)
b) \( \frac{1}{6} + \frac{1}{3} - \frac{1}{4} = \frac{1 \cdot 2 + 1 \cdot 4 - 1 \cdot 3}{12} = \frac{2+4-3}{12} = \frac{3}{12} = \frac{1}{4} \)
Ответы:
a) 7/15
b) 1/4