Réponses

2013-11-13T13:08:32+01:00
Bonjour

a 8/3X-4/5
a = -32/15

 b -7/2X1/5
b = -7/10

 c _2/3X3/2
c = -6/6 ou -1  j'ai pris le tiret devant le 2 pour 1 moins.

 d  7X-1/21
d = -7/21 = -1/3

e 5/6_3/8
= 40/48 - 18/48 = 22/48 = 11/24

f  -5/4+7/10
f = -50/40 + 28/40 = -22/40 = -11/20

 g  _1/6-1/9 
g = -9/54 - 6/54 = - 15/54 = - 5/18
h 3/8-  -31/20
= 60/160 - 248/160 = - 188/160 = -47/40