Question

calcule
a) (2,5×10^12).(4,0×10^-5)
b) (3,6×10^-4).(5,5×10^-5)
c) (4,0×10^-15)÷(8,0×10^10)​

Answer 1

Explicação passo-a-passo:

a) (2,5×10^12).(4,0×10^-5)

= 2,5.4 . 10^(12-5)

= 10 . 10⁷

= 1. 10⁸

b) (3,6×10^-4).(5,5×10^-5)

36/10 . 55/10 . 10^(-9)

36.55. 10^(-9). 10^(-2)

1980 . 10^(-11)

= 1,98. 10³ . 10^(-11)

= 1,98.10^(-8)

c) (4,0×10^-15)÷(8,0×10^10)

4/8 . 10^(-15)/10^10

1/2 . 10^(-25)

0,5 . 10^(-25)

5.10^(-1). 10^(-25)

= 5.10^(-26)