Question

calculati:(2,5x10^-3)x(8,4x10^-2
b)(4,5x10^-2):(1,5x10^-3)
c)(3,6x10^5)x[(2,4)^1x10^2]
d)(6,4x10^-4):(1,6x10^-3)

Answer 1

a)(2,5x10^-3)x(8,4x10^-2)=
=(25/10 x 1/10^3)x(84/10x 1/10^2)=
=(25/10^4)x(84/10^3)=
=2100/10^7=
=21/10^5
=21/100000
=0,00021

 b)(4,5x10^-2):(1,5x10^-3)=
=(45/10 x 1/10^2):(15/10x1/10^3)=
=(45/10^3):(15/10^4)=
=(45/10^3) x (10^4/15)=
=(3/1) x (10)=30


c)(3,6x10^5)x[(2,4)^1x10^2]=
=8,64x10^7=
=864x10^5=
=86400000



 d)(6,4x10^-4):(1,6x10^-3) =
=(64/10x1/10^4):(16/10x1/10^3) =
=(64/10^5):(16/10^4) =
=(64/10^5) × (10^4/16) =
=4/10=2/5