Question

Вычислите запишите решение и ответ

Answer 1

$\displaystyle \tt (\frac{1}{4}-\frac{1}{5})\cdot80-(2\frac{9}{16}+1\frac{1}{17}\cdot\frac{17}{18})\cdot\frac{16}{19}=1\\\\\\\\\displaystyle \tt 1) \: \frac{1}{4}-\frac{1}{5}=\frac{5}{20}-\frac{4}{20}=\frac{1}{20}\\\\\displaystyle \tt 2) \: 1\frac{1}{17}\cdot\frac{17}{18}=\frac{18}{17}\cdot\frac{17}{18}=1\\\\ \displaystyle \tt 3) \: 2\frac{9}{16}+1=3\frac{9}{16}\\\\ \displaystyle \tt 4) \: \frac{1}{20}\cdot80=\frac{80}{20}=4$

$\displaystyle \tt 5) \: 3\frac{9}{16}\cdot\frac{16}{19}=\frac{57}{16}\cdot\frac{16}{19}=3\\\\\displaystyle \tt 6) \: 4-3=\bold{1}$

Ответ: 1