Respostas

2014-02-19T09:18:25-03:00
Resposta

A

6.4x10^7 - 8,1x10^7 = 24x10^7 - 8,1x10^7 = 15,9x10^7

B

7,54x10^8 - 3,7x10^7 = 7,54x10^8 - 0,37x10^8 = 7,17x10^8

C

1,28x10^5 + 4x10^3 = 128x10^3 + 4x10^3 = 132x10^3

D

(2x10^-5)^2 = 4x10^-10

E

10^15x10^-11 = 10^4

F

10^2x10^5 = 10^7
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