Найдите значения выражений 2 целых 1/6:(8 целых 3/4 - 5 целых 1/2) и 3 целых 17/20:(3...

1. $2 \frac{1}{6}: (8 \frac{3}{4} - 5 \frac{1}{2}) = 2 \frac{1}{6}: (8 \frac{3}{4}-5 \frac{2}{4})= 2 \frac{1}{6}:3 \frac{1}{4}= \frac{13}{6}: \frac{13}{4} = \frac{13}{6}* \frac{4}{13}= \frac{1}{3} * \frac{2}{1}$ = $\frac{2}{3}$
2. $3 \frac{17}{20}:(3 \frac{2}{5}+1\frac{11}{15})=3 \frac{17}{20}:(3 \frac{6}{15} + 1\frac{11}{15}) = 3 \frac{17}{20}:5 \frac{2}{15} = \frac{77}{20} : \frac{77}{15} = \frac{77}{20} * \frac{15}{77}=$ =
$= \frac{1}{4} * \frac{3}{1} = \frac{3}{4} = 0.75$