Question

Найдите значение выражения 2/3+7 3/7-2/21

Answer 1

14+147+9-2/27=

168/21=8

Answer 2

$frac{2}{3} + 7 frac{3}{7} - frac{2}{21} = \\1) frac{2}{3} + 7frac{3}{7} = frac{14}{21} + 7frac{9}{21} = 8frac{2}{21}\\2) 8frac{2}{21} - frac{2}{21} = 8$

Ответ: 8