Question

Sabendo que x=0,000013 e y=0,0000002 determine x.y e escreva em notaçao cientifica.

Answer 1

x=0,00 00 13 ==> x = 13.10^-6
y=0,00 00 00 2 ==> y = 2.10^-7

x.y =  (13.10^-6)(2.10^-7)

x.y= 26.10^-13 ou 

x.y= 2,6.10^-12

Answer 2

$x=0,000013=1,3\cdot10^{-5}\\ y=0,0000002=2\cdot10^{-7}\\ \\ x \cdot y=1,3\cdot10^{-5} \cdot 2\cdot10^{-7}=1,3\cdot2\cdot10^{-5+(-7)}\\ =2,6\cdot10^{-5-7}=2,6\cdot10^{-12}$