Respostas

2013-12-09T12:14:33-02:00
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
1 5 1
2013-12-09T12:21:51-02:00
0,04 → 4/100 → 1/25

125 → 5³

\log~125~=x\\ ~~~~~~~~\frac{1}{25} 


( \frac{1}{25} )^x=125\\(5^{-2})^x=5^3\\5^{-2x}=5^{3}\\
\\-2x=3~(-1)\\2x=-3\\x=-\frac{3}{2}
2 5 2