Question

найди значение выражения 3/7+8 2/3-2/21

Answer 1

3/7+ 8 2/3- 2/21=
(3•3)/(7•3) + 8 (2•7)/(3•7) - 2/21=

9/21+ 8 14/21- 2/21=
8 23/21- 2/21= 9 2/21- 2/21= 9.