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U6 = a.r^5 = 486
U4 = a.r³ = 54
------------------------- :
r² = 9
r = 3

U4 = a.r³ = 54
U4 = a.3³ = 54
U4 = a.27 = 54
a = 54 : 27 = 2

U7 = a.r^6 = 2 x 3^6 = 1458 (A)