Номер 146 пример 2 и 4

Question

Номер 146 пример 2 и 4

---

Answer 1

2) 1
2--- ÷ 2,5 = 8,4 ÷ 7х
7
8,4÷7х = 6
---
7
7х= 6
--- * 8,4
7
7*х = 1
7--
5
х = 1
7---÷7
5
х = 1
1 ---
35