modif tache 4 et 5
Merge branch 'master' of https://github.com/jdewasseige/projet-1225

Conflicts:
	tache4/tache4.tex
Ajouter intro tache5 + correction tache4 et 5
Merge branch 'master' of https://github.com/jdewasseige/projet-1225

Conflicts:
	tache4/tache4.tex
Merge branch 'master' of https://github.com/jdewasseige/projet-1225