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Laizegabriele26
@Laizegabriele26
April 2020
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Mee ajudem !
Dê o valor na forma decimal !
a) 2-¹
b) 10-³
c)(-2)-²
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biellkl08
Verified answer
Respostas
a) 0,5
2^-1 = 1/2
1/2 = 0,5
b)0,001
10^-3 = (1/10)^3
(1/10)^3 = 0,001
c)0,25
(-2)^-2 = (-1/2)^2
(-1/2)^2 = 0,25
12 votes
Thanks 13
eluciamonteiro
Quando o expoente for negativo, inverte-se a base para torná-lo positivo.
a) 2-¹
(1/2)
¹ =
1/2 = 0,5
b) 10-³
(1/10)³ = 1/10 × 1/10 × 1/10 =
1/1000 = 0,001
c)(-2)-²
(-1/2)² = (-1/2) × (- 1/2) =
+ 1/4 = 0,25
14 votes
Thanks 21
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Lista de comentários
Verified answer
Respostasa) 0,5
2^-1 = 1/2
1/2 = 0,5
b)0,001
10^-3 = (1/10)^3
(1/10)^3 = 0,001
c)0,25
(-2)^-2 = (-1/2)^2
(-1/2)^2 = 0,25
a) 2-¹
(1/2)¹ = 1/2 = 0,5
b) 10-³
(1/10)³ = 1/10 × 1/10 × 1/10 = 1/1000 = 0,001
c)(-2)-²
(-1/2)² = (-1/2) × (- 1/2) = + 1/4 = 0,25