Question

Efetue as operações de adoção e subtração com números na forma de notação científica:
a)1,3.10^3+3,2.10^3=
b)7,4.10^2-4,1.10^2=
c)4,65.10^5-1,34.10^5=
d)3,91.10^4+2,38.10^4=

​

Answer 1

a)

1,3 . 10³ + 3,2 . 10³ = (1,3 + 3,2).10³ = 4,5 . 10³

b)

7,4 . 10² - 4,1 . 10² = (7,4 - 4,1) . 10² = 3,3 . 10²

c)

4,65 . 10^5 - 1,34 . 10^5 = (4,65 - 1,34) . 10^5 = 3,31 . 10^5

d)

3,91 . 10^4 + 2,38 . 10^4 = (3,91 + 2,38) . 10^4 = 6,29 . 10^4

Answer 2

$\mathtt{a)}~\mathsf{1,3\cdot10^3+3,2\cdot10^3=4,5\cdot10^3}\\\mathtt{b)}~\mathsf{7,4\cdot10^2-4,1\cdot10^2=3,3\cdot10^2}\\\mathtt{c)}~\mathsf{4,65\cdot10^5-1,34\cdot10^5=3,31\cdot10^5}\\\mathtt{d)}~\mathsf{3,91\cdot10^4+2,38\cdot10^4=6,29\cdot10^4}$