Réponses

2013-10-27T11:42:23+01:00
10 X 10(-1)/4 x 10(-4) = 10 x 10(-1) x 1/4 x 10 (4) = 2.5 x 10 (3)
2013-10-27T11:46:11+01:00
B = 2 x 10^2 x 5 x 10^-3 / 4 x 10^-4
= 200 x 1/200 / 1/2500
= 1 / 1/2500
= 2500 ou  2,5 x 10^3