Answered

formul explicite de U(n):
Un+1 =Un*Un+0.25
U0=0.25

Sagot :

n     | 0      | 1         | 2            | 3             | 4
U(n) | 0.25 | 0.3125 | 0.347656 | 0.370865 | 0.387541

U(0)=1/4
U(1)=(1/4)²+1/4=5/16
U(2)=(5/16)²+1/4=89/256