Réponses

2014-03-17T18:01:47+01:00
Bonsoir

A= -2/3+7/4
a = - 8/12 + 21/12
A = 13/12

B= -5/6-1/18
B = - 15/18 - 1/18
B = -16/18 = - 8/9

 C= 2/9x(-6/5)
C = 2/9 x - 6/5 = - 12/45

 D= -7/3:6/5 = -7/3 x 5/6 = - 35/18

 E= 2+7/6-7/24+1/8
E = 48/24 + 28/24 - 7/24 + 3/24
E = 79/24 - 7/24 = 72/24 = 3

 F= 7/8-3/8x11/3+7/6:(-4)
F = 7/8 - 33/24 + (7/6 x -1/4)
F = 7/8 -33/24 - 7/24
F = 21/24 -33/24 -7/24
F = 21/24 - 40/24 = - 19/24

G= 1+2/3+4/5-7/15

G = 15/15 + 10/15 + 12/15 -7/15
G = 37/15 - 7/15 = 30/15 = 2