Svpp aider pour les exercices 45 et 47.Merci beaucouppp​

Réponse:
A=1/4+1/4+1/4+1/4+1/4+1/4+1/4=7/4
B=1/5+1/5+1/5+1/5+1/5-1/5+1/5=3/5
C=1/6+1/6+1/6+1/6+1/6+1/6+1/6=7/6