Question

Calcule:
a) (2,5.10^2).(1,2.10^3)=
b) (4,8.10^-4).(1,05.10^2)=
c) (4,68.10^2):(1,04.10^-4)=
d) (2,616.10^3):(2,18.10^4)

ME AJUDEM​

Answer 1

a)

$2,5\cdot10^2\times1,2\cdot10^3\Rightarrow3\cdot10^{2+3}\Rightarrow3\cdot10^5$

b)

$4,8\cdot10^{-4}\times1,05\cdot10^2\Rightarrow5,04\cdot10^{-4+2}\Rightarrow5,04\cdot10^{-2}$

c)

$\frac{4,68\cdot10^2}{1,04\cdot10^{-4}}\Rightarrow\frac{4,68}{1,04}\cdot\frac{10^2}{10^{-4}}\Rightarrow4,5\cdot10^{2-(-4)}\Rightarrow4,5\cdot10^{2+4}\Rightarrow4,5\cdot10^6$

d)

$\frac{2,616\cdot10^3}{2,18\cdot10^4}\Rightarrow\frac{2,616}{2,18}\cdot\frac{10^3}{10^4}\Rightarrow1,2\cdot10^{3-4}\Rightarrow1,2\cdot10^{-1}$