Bonsoir,
On va poser a le rond le plus à gauche en dessous de la flèche indiquant x10
[[(a x 10 + 8) x 2 - 5] / 2] / 3 = a
[(10a + 8) x 2 - 5] / 6 = a
(20a + 16 - 5)/6 = a
(20a + 11)/6 = a
20a + 11 = 6a
20a - 6a = -11
14a = -11
a = -11/14
-11/14 x 10 = -11/7 x 5 = -55/7
-55/7 + 8 = -55/7 + 56/7 = 1/7
1/7 x 2 = 2/7
2/7 - 5 = 2/7 - 35/7 = -33/7
-33/7 / 2 = -33/14
-33/14 / 3 = -11/14
La boucle est bouclée :)
