Réponses

2014-09-20T19:59:33+02:00
A = 48 x 15² / 30²
= 48 x 225 / 900
= 48 x 1 / 4
= 12

B = 2^3 x 5² / 60² x 4
= 8 x 25 / 3 600 x 4
= 200 / 14 400
= 1 / 72