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Meilleure réponse !
2014-09-23T20:15:25+02:00
Bonsoir

A = 2/3 - 56/63  = 42/63 - 56/63 = - 14/63 = - 2/9

B = (9/12 - 10/12) x 3/2 = -1/12 x 3/2 = - 3/24 = -1/8

C = 11 : (4/6 - 15/6) = 11 : -11/6 = 11 x - 6/11 = - 66/11 = - 6

D = 3/7 - 15/7 x 24/5 = 3/7 - 360/35 = 15/35 - 360/35 = - 345/35 =  -69/7

E = ( 55/35 - 14/35) x 24/7 = 41/35 x 24/7 = 984/245 

F = 25/15 x ( 4/72 + 3/72) = 25/15 x 7/72 = 175/1080 = 35/216