Réponses

2014-09-11T17:48:47+02:00
A = 3 / 4 - 5 / 6 + 7 / 3
= 3 / 4 - 5 / 6 + 14 / 6
= 3 / 4 + 9 / 6
= 3 / 4 + 3 / 2
= 3 / 4 + 6 / 4
= 9 / 4

B = 4 / 5 - ( 7/10 - 5/6 ) 
= 4 / 5 - ( 42 / 60 - 50 / 60 )
= 4 / 5 + 8 / 60
= 4 / 5 + 2 / 15
= 12 / 15 + 2 / 15
= 14 / 15

C = 2 + 2 / 3 x 1 / 4
= 2 + 2 / 12
= 13 / 6