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Sagot :

VINS

bonsoir

f (x) = 9 + 0. 4x

pour 5 = 9 + 5 *0.4 = 5 + 2 = 7

pour 10 = 9 + 10 * 0.4 = 9 + 4 = 13

etc ... il suffit de remplacer x

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