Решение:
б) $$9 \cdot (8 - 1\frac{1}{9}) = 9 \cdot (8 - \frac{1 \cdot 9 + 1}{9}) = 9 \cdot (8 - \frac{10}{9}) = 9 \cdot 8 - 9 \cdot \frac{10}{9} = 72 - 10 = 62$$;
г) $$(4 - 1\frac{1}{2}) \cdot 15 = (4 - \frac{1 \cdot 2 + 1}{2}) \cdot 15 = (4 - \frac{3}{2}) \cdot 15 = 4 \cdot 15 - \frac{3}{2} \cdot 15 = 60 - \frac{45}{2} = 60 - 22\frac{1}{2} = 37\frac{1}{2}$$;
д) $$8\frac{5}{11} \cdot 4\frac{2}{9} + 8\frac{5}{11} \cdot 6\frac{7}{9} = 8\frac{5}{11} \cdot (4\frac{2}{9} + 6\frac{7}{9}) = 8\frac{5}{11} \cdot (4 + \frac{2}{9} + 6 + \frac{7}{9}) = 8\frac{5}{11} \cdot (10 + \frac{9}{9}) = 8\frac{5}{11} \cdot 11 = \frac{8 \cdot 11 + 5}{11} \cdot 11 = \frac{93}{11} \cdot 11 = 93$$;
е) $$6\frac{1}{5} \cdot 7\frac{1}{6} - 2\frac{1}{6} \cdot 6\frac{1}{5} = 6\frac{1}{5} \cdot (7\frac{1}{6} - 2\frac{1}{6}) = 6\frac{1}{5} \cdot (7 - 2 + \frac{1}{6} - \frac{1}{6}) = 6\frac{1}{5} \cdot 5 = \frac{6 \cdot 5 + 1}{5} \cdot 5 = \frac{31}{5} \cdot 5 = 31$$;