2,279 Выполните умножение: a) 11.11; 6); B) 11; r); д) 2e) 1\17

a) $$1\frac{1}{8} \cdot 1\frac{1}{5} = \frac{9}{8} \cdot \frac{6}{5} = \frac{9}{4} \cdot \frac{3}{5} = \frac{27}{20} = 1\frac{7}{20}$$

б) $$\frac{2}{9} \cdot \frac{8}{11} = \frac{16}{99}$$

в) $$1\frac{1}{8} \cdot 1\frac{7}{9} = \frac{9}{8} \cdot \frac{16}{9} = \frac{1}{1} \cdot \frac{2}{1} = 2$$

г) $$1\frac{4}{21} \cdot 4\frac{1}{5} = \frac{25}{21} \cdot \frac{21}{5} = 5$$

д) $$2\frac{2}{7} \cdot 1\frac{1}{4} = \frac{16}{7} \cdot \frac{5}{4} = \frac{4}{7} \cdot \frac{5}{1} = \frac{20}{7} = 2\frac{6}{7}$$

e) $$1\frac{1}{5} \cdot 1\frac{17}{18} = \frac{6}{5} \cdot \frac{35}{18} = \frac{1}{1} \cdot \frac{7}{3} = \frac{7}{3} = 2\frac{1}{3}$$

Ответ:

• a) $$1\frac{7}{20}$$
• б) $$\frac{16}{99}$$
• в) $$2$$
• г) $$5$$
• д) $$2\frac{6}{7}$$
• е) $$2\frac{1}{3}$$