2. Найдите значение выражения: a) 3$$\frac{3}{5}$$:2$$\frac{1}{10}$$; б) 7$$\frac{8}{15}$$\cdot 1$$\frac{2}{13}$$-3$$\frac{17}{20}$$\cdot 1$$\frac{2}{13}$$.

a) 3$$\frac{3}{5}$$:2$$\frac{1}{10}$$ = $$\frac{18}{5}$$\div$$\frac{21}{10}$$ = $$\frac{18}{5}$$\cdot$$\frac{10}{21}$$ = $$\frac{18 \cdot 10}{5 \cdot 21}$$ = $$\frac{6 \cdot 2}{1 \cdot 7}$$ = $$\frac{12}{7}$$ = 1$$\frac{5}{7}$$

б) 7$$\frac{8}{15}$$\cdot 1$$\frac{2}{13}$$-3$$\frac{17}{20}$$\cdot 1$$\frac{2}{13}$$ = 7$$\frac{8}{15}$$\cdot$$\frac{15}{13}$$-3$$\frac{17}{20}$$\cdot$$\frac{15}{13}$$ = $$\frac{12 \cdot 15}{15 \cdot 13}$$-$$\frac{77 \cdot 15}{20 \cdot 13}$$ = $$\frac{123 \cdot 1}{1 \cdot 13}$$-$$\frac{77 \cdot 3}{4 \cdot 13}$$ = $$\frac{123}{13}$$-$$\frac{231}{52}$$ = $$\frac{123 \cdot 4 - 231}{52}$$ = $$\frac{492 - 231}{52}$$ = $$\frac{261}{52}$$ = 5$$\frac{1}{52}$$

Ответ: а) 1$$\frac{5}{7}$$; б) 5$$\frac{1}{52}$$