Respostas

2014-05-07T11:25:51-03:00
A)5^x+1 + 5^x+2 = 5+5+5+5
x+1+x+2=4
2x=4-3
x=1sobre2

b)2^x-1 + 2^x+2 = 2^5 + 2^2
x-1+x+2=5+2
2x+1=7
2x=6
x=3

c)3^x+1 + 3^x+2 = 3^2 + 3
x+1+x+2=2+1
2x+3=3
2x=0
x=0

d)2^x+1 + 2^x+3 = 2^4 + 2^2
x+1+x+3=4+2
2x+3=6
2x=6-3
2x=3
x=3sobre2

Espero ter ajudado