Réponses

2014-01-09T10:29:24+01:00
AM = 5AB + CA
CN = 2AB + AC - 3(BA + AC) = 2AB + AC - 3BA - 3AC
= 2AB + AC + 3AB - 3AC = 5AB -2AC
mais AN = AC + CN = AC + 5AB -2AC = 5AB - AC = 5AB + CA
donc AM = AN et M = N