Question

2 – Faça as operações com Notação Científica: (5 Pontos)
A) (7x1011) . (6x10-5) =
B) (25x1027) : (5x1019) =
C) (2x107) + (500x105) =
D) (3000x1015) – (1,5x1018) =
E) (6x1023) . (3x102) =

Answer 1

A)

$7\cdot10^{11}\cdot6\cdot10^{-5}=42\cdot10^{11-5}=4,2\cdot10^{7}$

B)

$\dfrac{25\cdot10^{27}}{5\cdot10^{19}} =5\cdot10^{27-19}=5\cdot10^{8}$

C)

$2\cdot10^{7}+500\cdot10^{5}=200\cdot10^{5}+500\cdot10^{5}=(200+500)10^{5}=700\cdot10^{5}=7\cdot10^{7}$

D)

$3000\cdot10^{15}-1,5\cdot10^{18}=3\cdot10^{18}-1,5\cdot10^{18}=(3-1,5)10^{18}=1,5\cdot10^{18}$

E)

$6\cdot10^{23}\cdot3\cdot10^{2}=18\cdot10^{23+2}=18\cdot10^{25}=1,8\cdot10^{26}$