Os números reais x são soluções das inequações 25^1-x < 1/5 se, e somente se:
a)x>-3/2
b)x>3/2
c)-3/2< x < 3/2
d)x< 3/2
e)x< -3/2
a)x>-3/2
b)x>3/2
c)-3/2< x < 3/2
d)x< 3/2
e)x< -3/2
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5^2(1-x) < 5^-1
2(1-x) < -1
2-2x < -1
-2x < -1 -2
-2x < -3 x(-1)
2x > 3 (inverte o sinal)
x > 3/2 B