Réponses

2013-11-24T02:09:06+01:00
     B= 4 ( 3/4 - -1/2) - (1/2+ 5/-6)
1) B = 4 (3/4+ 1/2) - 1/2 + 5/6 = 3 +2 - 1/2 + 5/6 = 5 1/3
2) B = 4 (9/12+6/12) - 6/12 +10/12 = 4 * 15/12+ 4/12 = 64/12 = 5 1/3