Question

Calcule o valor da repressão
A) 2^5 x 10^5 x 20^-3

B ) (8^2 : 2^2 x 4^3 )^10

C) 5^-2 : 5^8 x 5^-2 : 5^-5

Answer 1

a) 2^5 x 10^5 x 20^-3

(2*10)^5 x 20^-3

20^5x20^-3

20^5+(-3)

=20^2

=400

b)(8^2÷2^2x4^3)^10

[(2^3)^2÷2^2x(2^2)^3]^10

(2^6÷2^2x2^6)^10

(2^6÷2^2+6)^10

(2^6 ÷2^8)^10

(2^6-8)^10

(2^-2)^10

2^-20

(1/2)20

C)5^-2÷5^8x5^-2 ÷5^-5

5^-2÷5^8-2÷5^-5

5^-2÷5^6÷5^-5

5^-2-6+5

5^-3

(1/5)3

1/125

Pronto, espero ter ajudado

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