Respostas

2014-07-15T14:27:55-03:00
9^x-2 = 27
3^2*(x-2) = 3³
iguala-se as bases resolve-se os expoentes

2*(x-2) = 3
2x - 4 = 3
2x = 7
x = 7/2

x = 3,5
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