Question

Помогите пж решить пример.

Answer 1

(5 1/21 - а) - (а - 1 5/7) = 5 1/21 - а - а + 1 5/7 = 5 1/21 + 1 5/7 - 2а = 5 1/21 + 1 15/21 - 2а = 6 16/21 - 2а = 6 16/21 - 2 * 2 1/3 = 6 16/21 - 2 * 7/3 = 6 16/21 - 14/3 = 6 16/21 -
4 2/3 = 6 16/21 - 4 14/21 = 2 2/21