Réponse:
1)
A=1/2x3+1/6x1=3/6+1/6=4/6
B=1/6x1+1/3x2=1/6+2/6=3/6
C=1/2x3-1/6x1=3/6-1/6=2/6
2)
Non parce que: 2/3x4-3/4x3=8/12-9/12=-1/12
3) I don't no
4) I don't no
