Question

Efetue em notação cientifica

a)1,28.10^5+4.10³
b)2.10^-6.4.10-²
c)4,8.10-³ : 1,2. 10^4
d)(2.10^-5)²
f) √ 25×10^6

Answer 1

A)=132000
B)=0,00000008
C)0,0000004
D)nao conseguir
F)5000000

Answer 2

a)1,28.10^5+4.10³ = (1,28x10² +4)x10³ = (128+4)x10³ ==>132x10³

b)2.10^-6.4.10-² = (2.10^-4 - 4)x10^-2 = 0,0002-4)x10^-2= -3,996x10^-2
(0,0002-4)x10^-2
= -3,996x10^-2 ==> 3996x10^-3x10^-2 ==> - 3996x10^-5

c)4,8.10-³ : 1,2. 10^4 = 5,76x10^1  

d)(2.10^-5)² = 4 x10^-10

f) √ 25×10^6 = 5x10^3