2. Выполните умножение. 35 a)= 3.10 б) 5 6 5 21 9 11 11 27 3 20 5 15 72 13 11 = =0 = 26 3 11 13 53 85 14 50 B) 9 10 25 16 45 21 26 7 36 7 14 5 г) 49 13 49 12 15 42

а) $$\frac{3}{5}\cdot \frac{5}{6}=\frac{3\cdot 5}{5\cdot 6}=\frac{3}{6}=\frac{1}{2}$$

б) $$\frac{3}{5}\cdot \frac{10}{21}=\frac{3\cdot 10}{5\cdot 21}=\frac{30}{105}=\frac{2}{7}$$

в) $$\frac{5}{9}\cdot \frac{3}{10}=\frac{5\cdot 3}{9\cdot 10}=\frac{15}{90}=\frac{1}{6}$$

г) $$\frac{26}{49}\cdot \frac{7}{13}=\frac{26\cdot 7}{49\cdot 13}=\frac{2}{7}$$

$$\frac{9}{11}\cdot \frac{11}{27}=\frac{9\cdot 11}{11\cdot 27}=\frac{9}{27}=\frac{1}{3}$$

$$\frac{3}{5}\cdot \frac{20}{15}=\frac{3\cdot 20}{5\cdot 15}=\frac{60}{75}=\frac{4}{5}$$

$$\frac{7}{26}\cdot \frac{2}{3}=\frac{7\cdot 2}{26\cdot 3}=\frac{14}{78}=\frac{7}{39}$$

$$\frac{13}{11}\cdot \frac{11}{13}=\frac{13\cdot 11}{11\cdot 13}=1$$

$$\frac{8}{25}\cdot \frac{5}{16}=\frac{8\cdot 5}{25\cdot 16}=\frac{40}{400}=\frac{1}{10}$$

$$\frac{14}{45}\cdot \frac{50}{21}=\frac{14\cdot 50}{45\cdot 21}=\frac{100}{27}$$

$$\frac{26}{49}\cdot \frac{7}{12}=\frac{26\cdot 7}{49\cdot 12}=\frac{182}{588}=\frac{13}{42}$$

$$\frac{14}{15}\cdot \frac{5}{42}=\frac{14\cdot 5}{15\cdot 42}=\frac{70}{630}=\frac{1}{9}$$

Ответ: $$\frac{1}{2}; \frac{2}{7}; \frac{1}{6}; \frac{2}{7}; \frac{1}{3}; \frac{4}{5}; \frac{7}{39}; 1; \frac{1}{10}; \frac{100}{27}; \frac{13}{42}; \frac{1}{9}$$