Réponses

2014-09-13T23:19:34+02:00
(3 x 10^2 x 12 x (10^-3)^-4) / (0,4 x 10^-7)

((3 x 12)/4) x ((10^2 x 10^-12 ) /10^1 x 10^-7)

(36/4) x (10^2-12-1+7)

9 x 10^-4

= 0,0009
2014-09-14T00:12:14+02:00
(3x10^2 x12x (10^-3)^! 4)/(0,4x10^-7) ((3 x12)/4) x ((10^3x10^-13)/10^1x10^-7) (36/4) x10^2-12-1+7) 9x10^-4= 0,0009 normalement c'est sa :)