Respostas

2013-11-14T14:36:56-02:00
Só faltou a c) =(

a)
0,001 = 10^x
10^-3 = 10^x
x = -3

b) 
2 log 100 = 10^x
10^2 = 10^x
x = 2
2 * 2 = 4

d) 
7 = 49^x
7^1 = 7^7x
1 = 7x
x = 1/7

e)
512 = 8^x
2^9 = 2^3x
3x = 9
x = 9/3
x = 3
 
 
3 3 3