5 - Assinale o que for correto
a) (-1)-(-64) = +63( )
b)(-8) (- 9) = -72 ( )
c)(- 125): (+25) --5 () )
d) (- 6) '= -216 ( )
e) - 49 --7 ()
Soluções para a tarefa
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Resposta:
A) 3^{-2}3
−2
.5² = \frac{5^2}{3^2} = \frac{25}{9}
3
2
5
2
=
9
25
B) 2¹⁰.2⁸:2⁶ = \frac{2^{10+8}}{2^6} = \frac{262144}{64} = \frac{4096}{1}
2
6
2
10+8
=
64
262144
=
1
4096
C) (1/4)³ = \frac{1}{4^3} =\frac{1}{64}
4
3
1
=
64
1
D) (1/4)‐² = (\frac{1}{4}) ^{-2}= (\frac{4}{1}) ^{2} = \frac{4^2}{1} = \frac{16}{1}(
4
1
)
−2
=(
1
4
)
2
=
1
4
2
=
1
16
E) (1/2)⁶. (1/2)¹² : (1/2)⁸ = \frac{1}{2^6} . \frac{1}{2^{12}} : \frac{1}{2^8} =\frac{2^8}{2^{6+12}} = \frac{256}{262144} =\frac{1}{1024}
2
6
1
.
2
12
1
:
2
8
1
=
2
6+12
2
8
=
262144
256
=
1024
1
F) (5 x 4)² : (5⁴ x 2⁴) = \frac{20^2}{625.16}= \frac{400}{10000} = \frac{1}{25}
625.16
20
2
=
10000
400
=
25
1
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