Réponses

2013-11-11T18:54:52+01:00
A=9 /5- 21/5 : 7/15
=9/5-21/5*15/7
=9/5-315/35
=9/5-9
=9/5-45/5
=-36/5
2013-11-11T18:56:41+01:00
A = 9/5 - 21/5 : 7/15
= 9/5 - 21/5 x 15/7
= 9/5 - 315/35
= 63/35 - 315/35
= -252/35
= -36/5