Bonjour,
1)
u1 = (1/2)*u0 = (1/2)*1 = (1/2)
u2 = (1/2)*u1 = (1/2)*(1/2) = (1/4)
u3 = (1/2)*u2 = (1/2)*(1/4) = (1/8)
u4 = (1/2)*u3= (1/2)*(1/8) = (1/16)
u5 = (1/2)*u4 = (1/2)*(1/16) = (1/32)
Conjecture formule explicite :
un = (1/2)^n
2)
u1 = u0 + 5 = 1 + 5 = 6
u2 = u1 + 5 = 6 + 5 = 11
u3= u2 + 5 = 11 + 5 = 16
u4= u3 + 5 = 16 + 5 = 21
u5= u4 + 5 = 21 + 5 = 26
Conjecture formule explicite :
un = 5n + 1
