Réponses

2014-03-01T17:01:20+01:00
Vn=lnUn - ln2=ln(Un/2)
Vn+1=ln(Un+1/2)
= ln((racine(2Un))/2)
=ln(racine(2Un)) - ln2
=1/2*ln(2Un) - ln2
=1/2lnUn+1/2 ln2 -ln2
= 1/2lnUn - 1/2 ln2
= 1/2 ( lnUn- ln2)
= 1/2Vn