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Sagot :

Réponse:

[tex]a(2) = \frac{1}{5} \times 4 + \frac{2}{5} \times2 - \frac{3}{5} \\ = \frac{4}{5} + \frac{4}{5} - \frac{3}{5} \\ = \frac{5}{5} \\ = 1[/tex]

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