Bonjour
M : (3.8 X +3.99) / (x+1) = 3.81
M : 3.8x +3.99 = 3.81 * (x+1)
M : 3.8x +3.99 = 3.81 x +3.81
M : 3.99-3.81 = 3.81x -3.8x
M : 0.18 = 0.01 x
M : 0.18/ 0.01 = x
M : x = 18
vérifions :
3.8*18 +3.99 = 72.39
72.39/ (18+1) = 3.81
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Bonjour
M : (3.8 X +3.99) / (x+1) = 3.81
M : 3.8x +3.99 = 3.81 * (x+1)
M : 3.8x +3.99 = 3.81 x +3.81
M : 3.99-3.81 = 3.81x -3.8x
M : 0.18 = 0.01 x
M : 0.18/ 0.01 = x
M : x = 18
vérifions :
3.8*18 +3.99 = 72.39
72.39/ (18+1) = 3.81