Respostas

2013-12-09T12:12:46-02:00
125 | 5
_25 | 5
__5 | 5
__1
125 = 5^3
0,04 = 4/100
4/100 = 2/50 = 1/25
1/25 = 1/5^2 = 5^(-2)
[5^(-2)]^x = 5^3
5^(-2x) = 5^3 
-2x = 3
x = -3/2