Réponses

2013-09-13T17:52:14+02:00
2013-09-13T19:00:02+02:00
Bonsoir
A = 8/3 -5/3 : 20/21
= 8/3 -5/3 x 21/20
= 8/3 - 1/1 x 7/4
= 8/3 - 7/4
= 32/12 - 21/12
= 11/12

b) (2+2/3) : (4/5-2/3)
= (6/3 +2/3) : (12/15 - 10/15)
= 8/3 : 2/15
= 8/3 x 15/2
= 120/6 = 20

c) -3+6 : (-2)x3
= -3 +6 : -6
= -3 -1
= -4