Réponse :
bonjour
Explications étape par étape :
A= 1/7+2/7 = 3/7
B=5/8-7/8=-2/8=-1/4
C=2+2/3 = 6/3+2/3=8/3
D=1/4+5/8=2/8+5/8=7/8
E=1/5+7/15=3/15+7/15=10/15=5/3
F=1-6/8=8/8-6/5=2/8=1/4
G=2-8/3 = 6/3-8/3=-2/3
H=5/7+1/2=10/14+7/14=17/14
I=3/7-8/35 = 15/35-8/35=7/35=1/5
J=5-5/3+7/6 = 30/6 -10/6+7/6 = 27/6
K=2/5+4/3-1=6/15 +20/15-15/15 = 11/15
L=4-(5/6+3/2)
=4-(5/6+9/6)
=4-14/6
=24/6-14/6
=10/6
=5/3
