Bonjour,
Toutes les lettres ci-dessous ont une flèche au-dessus.
1) AE + AO
= AE + EB
= AB
2) AE + DF
= AE + EB
= AB
3) BD - BA - AO
= BD - CD - OC
= BD + DC + CO
= BO
4) OC - FC
= OC + CF
= OF
5) DO + BC + AE
= DO + OF + FC
= DC
6) AB + AD
= AB + BC
= AC
