(n)

0
1
2
3
4
5
6
7
8
9

(A)

1000
580
433
381,55
363,5425
357,239875
355,0339563
354,2618847
353,9916596
353,8970809

(B)

0
420
567
618,45
636,4575
642,760125
644,9660438
645,7381153
646,0083404
646,1029191

Conjecturer le sens de variation de (A) et (B). Justifier.