Réponses

2013-12-21T11:47:11+01:00
(2×10^3×5×10^10)/2×10 = 5×10^13/10 = 5×10^12
2013-12-21T12:07:26+01:00
C = 2 x 10^3 x 5 x (10^-5)^2 sur 2 + 18
=  2 000 x 5 x 10^-10 sur 20
= 10 000 x 10^-10 sur 20
= 5 x 10^-8