Question

5x{270-[15+(123-36:c)]:7}+10=270 c=?

Answer 1

Daca nu ai pus parantezele gresit, rezolvarea este:

5 x {270 - [15 + (123 - 36 : c)]:7} + 10 = 270 ⇔ 
5 x {270 - [15 + (123 - 36 : c)]:7} = 260 ⇔
270 - [15 + (123 - 36 : c)]:7 = 260:5 = 52 ⇔
270 - 52 = [15 + (123 - 36 : c)] : 7 ⇔
218 = [15 + (123 - 36 : c)] : 7 ⇔
218  * 7 = 15 + (123 - 36:c) ⇔
1526 -15 = 123 - 36 : c ⇔
1526-15-123 = -36:c ⇔
1388 = -36 : c ⇒ c = -36/1388 = - 9/347