5⁴ = 5 x 5 x 5 x 5 = 625
donc A = 2 + 3 x 625 = 2 + 1875 = 1877
2³ = 2 x 2 x 2 = 8
donc B = 5 - 3 x 8 = 5 - 24 = - 19
2² = 4 ; 5² = 25 ; 3² = 9 et 2³ = 8
donc C = 3 x 4 + 4 x 25 - 9 x 8
= 12 + 100 - 72
tu finis