Réponses

Meilleure réponse !
2014-09-21T13:57:30+02:00
A = 4/3 + 3/10
       5/2- 2/5
A = 4 x 10 / 3 x 10 + 3 x 3 / 10 x 3
         5 x 5 / 2 x 5 - 2 x 2 / 5 x 2
A = 40/30 + 9/30
       25/10 - 4/10
A = 49/30 : 21/10
A = 49/30 x 10/21
A = 490/630
A = 70 x 7 / 70 x 9
A = 7/9

B = 2 - 5/2 : 15/4
B = 2 - 5/2 x 4/15
B = 2 - 20/10
B = 2 x 10 / 1 x 10 - 20/10
B = 20/10 - 20/10
B = 0

C = 1 +  1__
           1 + 1____
              1 + 1/2
C = 1 + 1/2 : 1 + 1/2
C = 1 x 2 / 1 x 2 + 1/2 : 1 + 1/2
C = 2/2 + 1/2 : 1 + 1/2
C = 3/2 x 1 + 1/2
C = 3/2 + 1/2
C = 4/2
C = 2 x 2 / 2 x 1
C = 2