Corrigé du 24 P. 44

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\[\begin{aligned} u_{14} &= u_{15} - r = -20 - (-4) = -20 + 4 = \boxed{-16\;;}& \\ u_{13} &= u_{14} - r = -16 + 4 = \boxed{-12\;;}& \\ u_{12} &= u_{13} - r = -12 + 4 = -8\;;& \\ u_{11} &= u_{12} - r = -8 + 4 = -4\;;& \\ u_{10} &= u_{11} - r = -4 + 4 = \boxed{0.}& \end{aligned}\]

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