bonjour
k (x) = 0.6 x + 1
k ( 2) = 0.6 * 2 + 1 = 1.2 + 1 = 2.2 donc G ∈ C
H ( 3.4) = 0.6 * 3.4 + 1 = 2.04 + 1 = 3.04 donc H ∉ C
