Respostas

2013-08-10T17:11:55-03:00
A) 2*x = 128
2*x = 2^7
x=7

b)2^(x – 2) = 8 
2^(x-2) = 2^3
x-2=3
x=5

c)5*x = 1/125 
5*x = 1/5³
5*x = 5*(-3)
x=-3

d) 4*x = 512
(2²)*x = 2^9
2*(2x) = 2*9
2x=9
x=9/2
1 5 1