Aidez-moi svp Exercices 1 : Dire si les suites sont arithmétiques :
a) Un = 3-4n
b) Vn = n²-n
c) Wn = 1/n
d) An = 1/5 n +5

Exercices n° 2 : Calculer les raisons des suites arithmétiques suivantes :
a) Un = -5n+1
b) Vn = 4(2n+3)
c) Wn = -n+2
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