Question

Реши уравнение: 7-(х+ 1 3/5)= 2 4/5

Answer 1

7 - (х + 1 3/5) = 2 4/5
7 - х - 8/5 = 14/5
- х = 14/5 + 8/5 - 7
- х = 22/5 - 7
- х = 22/5 - 35/5
- х = - 13/5
х = 13/5 или 2 3/5

проверка:
7 - (2 3/5 + 1 3/5) = 2 4/5
7 - (13/5 + 8/5) = 14/5
35/5 - 21/5 = 14/5
14/5 = 14/5