Bonsoir,
x
x+1
x+2
x+x+1+x+2 = 3x+3 = 3(x+1)
Un multiple de 3
99, 102, 105, 108, 111, 114, 117, 120,
99/3 = 33
33, 34, 35 =>102
102/3 = 34
34,35,36 => 105
105 /3 = 35
35,36,37 => 108
108/3 = 36
36,37,38 => 111
111/3 =37
37,38,39 =>114
114/3 = 38
38,39, 40 => 117
117/3 = 39
39,40,41 => 120