Réponses

2013-12-13T18:25:06+01:00
1\5-(-1/15+5/25)+2/3 
=1/5-(-1/15+1/5)+2/3
=1/5-(-1/15+3/15)+2/3
=1/5-2/15+2/3
=3/15-2/15+10/15
=11/15
2013-12-13T18:27:57+01:00
= 1\5 - ( -1/15 + 5/25 ) + 2/3 
= 1/5 - 2/15 + 2/3
= 1/15 + 2/3
= 11/15