Question

(30÷27-1/3)*21/7-2/5
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Answer 1

ответ:

$\displaystyle \frac{29}{15}=1\frac{14}{15}$

решение:

$\displaystyle (30:27-\frac{1}{3})*\frac{21}{7}-\frac{2}{5}=(\frac{30}{27}-\frac{1}3})*\frac{21}{7}-\frac{2}{5}=\frac{7}{9}*\frac{21}{7}-\frac{2}{5}=\frac{1}{9}*21-\frac{2}{5}=\\\\\frac{1}{3}*7-\frac{2}{5}=\frac{7}{3}-\frac{2}{5}=\frac{29}{15}=1\frac{14}{15}$