Réponses

2014-01-13T16:33:55+01:00
A. 3/7 : 5/2 = 3/7 x 2/5 = 6/35
B. 5 x 2/3 : 5/2  x 3/4 = 5 x 2/3 x 2/5 x 3/4 = 1
C. (2/5 - 2) / (2+5/6) = (2/5 - 10/5) / (12/6 + 5/6) = (-8/5) / (17/6) = -8/5 x 6/17 = -48/85
D. 3/5 + (1/3) / (7/4) + 1/2 = 3/5 + 4/21 + 1/2 = 63/105 + 20/105 + 1/2 = 83/105 + 1/2 = 166/210 + 105/210 = 271/210