Question

[(5/12 + 17/30 + 17/20) * 60 - 55 3/4] * 4/7 - 31
По действиям, пожалуйста

Answer 1

Ответ:

[(5/12 + 17/30 + 17/20) * 60 - 55 3/4] * 4/7 - 31 = 0

1) $(\frac{5}{12} +\frac{17}{30} +\frac{17}{20} )= \frac{25+34+51}{60} =\frac{110}{60}=\frac{11}{6}$

2)$55\frac{3}{4}=\frac{223}{4}$

3) $(\frac{11}{6}*60-\frac{223}{4} )*\frac{4}{7} - 31 = (11*10-\frac{223}{4} )*\frac{4}{7} - 31= (110-\frac{223}{4} )*\frac{4}{7} - 31$

4)$(110-\frac{223}{4} )=\frac{440-223}{4}=\frac{217}{4}$

5)$\frac{217}{4}*\frac{4}{7} -31=217*\frac{1}{7} -31=31-31=0$