Réponses

2014-03-06T16:47:04+01:00
Bonjour
A = 3 x (59 - 5x4²) - (8-13) =  3 x (59 - 5x 16) - (-7)
A = 3 x (59 - 80) +7
A = 3 x - 21 +7 = - 66 +7 = - 59


B = 17/3  - 25/2  x 1/15
17/3 - 25/30
170/30 -25/30 = 145/30 = 29/6

C =( 3 -2/3) : (4/3 x 7)
C = (9/3 -2/3) : 28/3
C = 7/3 x 3/28
C = 21/84 = 1/4