Question

5^4:5^2+5(55^1-x:5)=5^3 metoda mersului invers

Answer 1

* 5⁴ : 5² + 5 · (55¹ - x : 5) = 5³ 
5² + 5 · (55¹ - x : 5) = 5³ 
25 + 5 · (55 - x : 5) = 125
5 · (55 - x : 5) = 125 - 25 = 100
55 - x : 5 = 100 : 5 = 20 /-55
-x : 5 = -35 /·5
-x = -175 /·(-1)
x = 175.

/robertinni