1. Найдите произведение a)  3/7 × 5/11 б) 5/9 × 10/27 в) 2 1/10 × 1 1/14 г) 3 3/5 × 1/9 д) 12/13 × 6

a) $$rac{3}{7} \times \frac{5}{11} = \frac{3 \times 5}{7 \times 11} = \frac{15}{77}$$

б) $$rac{5}{9} \times \frac{10}{27} = \frac{5 \times 10}{9 \times 27} = \frac{50}{243}$$

в) $$2 \frac{1}{10} \times 1 \frac{1}{14} = \frac{21}{10} \times \frac{15}{14} = \frac{21 \times 15}{10 \times 14} = \frac{315}{140} = \frac{45}{20} = \frac{9}{4} = 2 \frac{1}{4}$$

г) $$3 \frac{3}{5} \times \frac{1}{9} = \frac{18}{5} \times \frac{1}{9} = \frac{18 \times 1}{5 \times 9} = \frac{18}{45} = \frac{2}{5}$$

д) $$rac{12}{13} \times 6 = \frac{12 \times 6}{13} = \frac{72}{13} = 5 \frac{7}{13}$$