Réponses

  • Utilisateur Brainly
2013-10-27T11:29:00+01:00
Sachant que : a² + b²+ c² = 1 que vaut : a^4 + (ab+c)² + (ac-b)² ?
a^4 + (ab+c)² + (ac-b)²
=a^4+a²b²+c²+2abc+a²c²+b²-2abc
=a^4+b²+c²+a²(b²+c²)
=a^4+1-a²+a²(1-a²)
=a^4+1-a²+a²-a^4
=1

2013-10-27T11:54:09+01:00