Question

выполните действия 2 * 2⅔ + 1/ 4 пятых* 3 ⅓- 2/5 шестых

Answer 1

$2cdot :2frac{2}{3}+1frac{4}{5}cdot :3frac{1}{3}-frac{2}{5}=frac{16}{3}+6-frac{2}{5}=6-frac{2}{5}+frac{16}{3}=6-frac{2}{5}+frac{16}{3}= \ frac{6cdot :15}{15}-frac{2cdot :3}{15}+frac{16cdot :5}{15}=frac{6cdot :15-2cdot :3+5cdot :16}{15}=frac{164}{15}=10frac{14}{15}$
$OTBET : boxed{10frac{14}{15}}$