1. Выполнить умножение: a)3$$\frac{3}{4}$$\cdot1$$\frac{7}{9}$$\cdot6);б)$$\frac{3}{4}$$\cdot$$\frac{2}{9}$$\cdot$$\frac{7}{5}$$\cdot1$$\frac{2}{14}$$.

a) 3$$\frac{3}{4}$$\cdot1$$\frac{7}{9}$$ =$$\frac{15}{4}$$\cdot$$\frac{16}{9}$$ =$$\frac{15\cdot16}{4\cdot9}$$ =$$\frac{5\cdot4}{1\cdot3}$$ =$$\frac{20}{3}$$ = 6$$\frac{2}{3}$$

б) $$\frac{3}{4}$$\cdot$$\frac{2}{9}$$\cdot$$\frac{7}{5}$$\cdot1$$\frac{2}{14}$$ =$$\frac{3}{4}$$\cdot$$\frac{2}{9}$$\cdot$$\frac{7}{5}$$\cdot$$\frac{16}{14}$$ =$$\frac{3\cdot2\cdot7\cdot16}{4\cdot9\cdot5\cdot14}$$ =$$\frac{1\cdot1\cdot1\cdot8}{1\cdot3\cdot5\cdot1}$$ =$$\frac{8}{15}$$

Ответ: a) 6$$\frac{2}{3}$$; б) $$\frac{8}{15}$$