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clara1193
@clara1193
April 2022
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Bonjour quelqu’un peut m’aider svp
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ayuda
bjrqui dit fonction affine ditf(x) = ax + bici lecture colonne par colonneon a doncf(-5) = -2etf(4) = 4on sait que f(-5) = a * (-5) + b = - 2et que f(4) = a * 4 + b = 4système à 2 équations-5a + b = - 24a + b = 4on les soustrait pour éliminer le b=> -5a - 4a = - 2 - 4=> - 9a = -6a = 2/3on trouve b4a + b = 4=> 4 * 2/3 + b = 4b = 4 - 8/3b = 4/3=> au final : f(x) = 2/3x + 4/3on vérifief(-5) = 2/3 * (-5) + 4/3 = - 10/3 + 4/3 = - 2etf(4) = 2/3 * 4 + 4/3 = 8/3 + 4/3 = 4okvous pouvez donc finirf(-2) = 2/3 * (-2) + 4/3 = ...idem pour f(7)et trouver x pour que f(x) = 2revient à résoudre 2/3x + 4/3 = 2
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