Réponses

2013-12-07T16:44:13+01:00
A = -4/7 + 5/6
= 11/42

B = 14 x (-4/7) x 5/6
= -8 x 5/6
= -20/3

C = 1 - 4/7 sur 1 - 5/6
= 3/7 sur 1/6
= 18/7

D = ( -4/7 - 1/6 ) - ( 5/6 + 3/7 )
= -31/42 - 53/42
= -2