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Epreuve de Mathématiques B L'usage de calculatrices est interdit.

Exercice 3 (D'après Banque PT ? Math A 2018). 1. Soit x ? Im(g). Il existe y ? E tel que g(y) = x. Puis f(x) = f(g(y)) = f ? g(y)=0 par hypothèse, donc x ...

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