Réponses

2014-06-17T21:26:20+02:00
6 carottes - 3 carottes + 1 carotte = 4 carottes


6ab-3ab+ab-3
=
4ab - 3
2014-06-17T21:50:47+02:00
6ab - 3ab + ab - 3
= 6ab + ab - 3ab - 3
=
4ab - 3