determine o valor numérico das expressões
a)(-1)-³-(-3)-¹
tem que ter as contas**
Soluções para a tarefa
Resposta:
a)
(-1)⁻²-(-3)⁻¹
= 1/(-1)² - 1/(-1)¹
= 1/1 - 1/(-1)
=1 -(-1)
=1+1=2
b)
(2⁻⁴ +4⁻²)⁻¹
= [(1/2⁴) +1/4²]⁻¹
=(1/16 +1/16)⁻¹
=(2/16)⁻¹
=16/2 = 8
c)
3⁻⁴ - 3⁻²
=1/3⁴ -1/3²
=1/81 -1/9
=1/81 -9/81
= -8/81
d)
(8⁻² * 4³ )⁻¹
=[(1/8)² * 16]⁻¹
=[1/64 *16]⁻¹
=(16/64)⁻¹
=64/16 = 4
Resposta:
Explicação passo a passo:
.
a) (- 1)-³ - (- 3)-¹ = (- 1/1)³ - (- 1/3)¹
. = - 1 - (- 1/3)
. = - 1 + 1/3 (m.m.c. = 3)
. = - 3;/3 + 1/3
. = - 2/3
.
b) (2^-4 + 4-²)-¹ = [ (1/2)^4 + (1/4)-² ]-¹
. = (1/16 + 1/16)-¹
. = (2/16)-¹
. = (16/2)¹
. = 16/2
. = 8
.
c) 3^-4 - 3-² = (1/3)^4 - )1/3)²
. = 1/81 - 1/9 (m.m.c. = 81)
. = 1/81 - 9/81
. = (1 - 9)/81
. = - 8/81
.
d) (8-² . 4³)-¹ = [ (1/8)² . 4.4.4 ]-¹
. = (1/64 . 64)-¹
. = (64/64)-¹
. = (1)-¹
. = 1
.
(Espero ter colaborado)