Номер 2.279

а) \(1\frac{1}{3}\cdot1\frac{2}{5}=\frac{4}{3}\cdot\frac{7}{5}=\frac{28}{15}=1\frac{13}{15}\)
б) \(2\frac{4}{9}\cdot3\frac{3}{11}=\frac{22}{9}\cdot\frac{36}{11}=8\)
в) \(1\frac{1}{8}\cdot1\frac{7}{9}=\frac{9}{8}\cdot\frac{16}{9}=2\)
г) \(1\frac{4}{21}\cdot4\frac{1}{5}=\frac{25}{21}\cdot\frac{21}{5}=5\)
д) \(2\frac{2}{7}\cdot1\frac{3}{4}=\frac{16}{7}\cdot\frac{7}{4}=4\)
е) \(1\frac{1}{5}\cdot1\frac{17}{18}=\frac{6}{5}\cdot\frac{35}{18}=\frac{7}{3}=2\frac{1}{3}\)