Réponses

2014-02-10T20:00:48+01:00
A= 3:7 -8:14.
3/7 : -8/14 = 3/7 x - 14/8 = - 42/56 = -3/4

  B=9:8+(-2):4
9/8 -2/4 = 9/8 - 4/8 = 5/8

C=3:5+4:3
3/5 + 4/3 = 9/15 + 20/15 = 29/15

2014-02-10T21:02:04+01:00


A= 3/7 - 8/14

A= 6/14 - 8/14

A= 2/14

A= 1/7

B= 9/8 + (-2/4)

B= 9/8 + (-4/8)

B= 5/8

C= 3/5 + 4/3

C= 9/15 + 20/15

C= 29/15