д) 3 3/4 * (4 1/2 : 6 3/4);

Решение примеров: д) $3\frac{3}{4} \cdot (4\frac{1}{2} : 6\frac{3}{4}) = \frac{15}{4} \cdot (\frac{9}{2} : \frac{27}{4}) = \frac{15}{4} \cdot (\frac{9}{2} \cdot \frac{4}{27}) = \frac{15}{4} \cdot (\frac{1}{1} \cdot \frac{2}{3}) = \frac{15}{4} \cdot \frac{2}{3} = \frac{5}{2} = 2\frac{1}{2}$ л) $(1\frac{2}{3} + 2\frac{4}{9}) : (4\frac{26}{27} - 2\frac{2}{9}) = (1\frac{6}{9} + 2\frac{4}{9}) : (4\frac{26}{27} - 2\frac{6}{27}) = 3\frac{10}{9} : 2\frac{20}{27} = 4\frac{1}{9} : 2\frac{20}{27} = \frac{37}{9} : \frac{74}{27} = \frac{37}{9} \cdot \frac{27}{74} = \frac{1}{1} \cdot \frac{3}{2} = \frac{3}{2} = 1\frac{1}{2}$ e) $(2\frac{2}{7} + 1\frac{1}{7}) \cdot 1\frac{1}{6} = 3\frac{3}{7} \cdot \frac{7}{6} = \frac{24}{7} \cdot \frac{7}{6} = \frac{4}{1} \cdot \frac{1}{1} = 4$ м) $(6\frac{1}{24} - \frac{2}{3}) : (3\frac{1}{2} + 1\frac{7}{8}) = (6\frac{1}{24} - \frac{16}{24}) : (3\frac{4}{8} + 1\frac{7}{8}) = (5\frac{25}{24} - \frac{16}{24}) : 4\frac{11}{8} = 5\frac{9}{24} : 5\frac{3}{8} = 5\frac{3}{8} : 5\frac{3}{8} = 1$