Réponses

2013-01-05T17:55:53+01:00

tu commences par la multiplication

A = 1/3 -4/21

A = 7/21 -4/21 = 3/21 = 1/7

 

B = 6/5 : 1/15 - 3/15

= 6/5 : -2/15

= 6/5*-15/2 = -90/10 = -9