a)
\( \frac{4}{11} + \frac{6}{11} - \frac{8}{11} = \frac{4+6-8}{11} = \frac{2}{11} \)
б)
\( 1 - \frac{9}{32} = \frac{32}{32} - \frac{9}{32} = \frac{32-9}{32} = \frac{23}{32} \)
в)
\( \left( \frac{3}{5} + \frac{1}{15} \right) \cdot 3 = \left( \frac{9}{15} + \frac{1}{15} \right) \cdot 3 = \frac{10}{15} \cdot 3 = \frac{2}{3} \cdot 3 = 2 \)
Ответ: а) 2/11, б) 23/32, в) 2.