Réponses

2013-12-09T18:26:59+01:00
A=7/15-2/12x9/4.  
=7/15-18/48
=7/15-3/8
=56/120-45/120
=11/120

B=(4/5:2/3)x(1/2-3/4).  
=(4/5*3/2)(2/4-3/4)
=12/10*(-1/4)
=-12/40
=-3/10

C=5/6+7/8x1/3-1/16:3/8
=5/6+7/24-1/16*8/3
=20/24+7/24-8/48
=27/24-4/24
=23/24
Merci de votre aide
S quoi les *
* est le signe x de la multilplication
Ok merci
2013-12-09T18:35:01+01:00
A = 7/15 - 2/12 x 9/4
= 7/15 - 3/8
= 11/120

  B = ( 4/5 : 2/3 ) x ( 1/2 - 3/4 )
= 6/5 x (-1/4)
= -3/10

C = 5/6 + 7/8 x 1/3 - 1/16 : 3/8
= 5/6 + 7/24 - 1/6
= 9/8 - 1/6
= 23/24