Question

Найдите значение выражения 2/3+6 3/7-2/21

Answer 1

2/3  +  6 3/7  -  2/21 = 2/3  +  45/7  -  2/21 = (2 × 7  +  45 × 3  -  2 × 1)/21 = 14/21  +  135/21  -  2/21 =  147/21 = 7

Answer 2

$\frac{2}{3}+6 \frac{3}{7} - \frac{2}{21} = \frac{2}{3}+ \frac{45}{7} - \frac{2}{21} = \\ \\ =\frac{14+135-2}{21} = \frac{147}{21}=7$

Ответ:7