Question

Простите я ошиблась
(30÷27-1/3)*2 1/7-2/5

Answer 1

ответ:

$\displaystyle \frac{19}{15}=1\frac{4}{15}$

решение:

$\displaystyle (30:27-\frac{1}{3})*2\frac{1}{7}-\frac{2}5}=(\frac{30}{27}-\frac{1}{3})*2\frac{1}{7}-\frac{2}{5}=(\frac{30}{27}-\frac{1}{3})*\frac{15}{7}-\frac{2}{5}=\frac{7}{9}*\frac{15}{7}-\frac{2}{5}=\\\\\frac{1}{9}*15-\frac{2}{5}=\frac{1}{3}*5-\frac{2}{5}=\frac{5}{3}-\frac{2}{5}=\frac{19}{15}=1\frac{4}{15}$