Réponses

2014-01-11T18:16:19+01:00
Bonsoir

A = (7/5 +8/15 -19/2) / 2/3
A = (42/30 + 16/30 - 285/30) : 2/3
A = -227/30 : 2/3
A = - 227/30 x 3/2
A = - 681/60 = -227/20

B = (3 -7/5) : (1 -9/10)
B = (15/5 - 7/5) : (10/10 -9/10)
B = 8/5 : 1/10
b = 8/5 x 10 = 80/5 = 16

C = (-7/8 + 5/6 -1) : 4
C = (- 21/24 + 20/24 - 24/24) : 4
C = -25/24 x 1/4 = - 25/96