Réponse :
Ex 4
u = AB + BC + CA
u = AC + CA
u = 0
w = AB + AC + BC
w = AB + BC + AC
w = AC + AC
w = 2 AC
x = DE + FG + EF + DG
x = DE + EF + FG + DG
x = DF + FG + DG
x = DG + DG
x = 2 DG
Ex 5
v = RT - ST + RS
v = RT + TS + RS
v = RS + RS
v = 2 RS
w = AB + MA - MB + BA
w = AB + MA + BM + BA
w = AB + BA + MA + BM
w = MA + BM
w = BM + MA
w = BA
x = 2MN - MP - PQ - MQ
x = 2MN - MQ - MQ
x = 2MN - 2MQ
x = 2MN + 2 QM
x = 2QM + 2MN
x = 2QN
Ex 6
1. AB = AE + EB
2. IJ = IL + LJ
3. RT = RA + AT
4. SD = TD + ST
5. RE = SE + RS
6. CD = CK + KL + LD
7. FA = CA + FG + GC
8. AT = AB + RT BS + SR
9. AB = AJ + JK + KB
Ex 7
v = AB + AC
v = AB - CA
v = - CA + AB
v = - CB
v = BC
Explications étape par étape :
