Question

Помогите пример
С простыми дробями.
(10/13 - 21/52 + 15/26) * 39 : 7

Answer 1

40/52-21/52+30/52=49/52
49/52*39/1=1911/52
1911/52:7=1911/52*1/7=273/52=5,25