Corrigé du 25 P. 22

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\[\begin{aligned} u_0 &= 20\;;& \\ u_1 &=u_0 - 2 = 20 - 2 = 18\;;& \\ u_2 &=u_1 - 2 = 18 - 2 = 16\;;& \\ u_3 &=u_2 - 2 = 16 - 2 = 14\;;& \\ u_4 &=u_3 - 2 = 14 - 2 = 12\;;& \\ u_5 &=u_4 - 2 = 12 - 2 = 10\;;& \\ u_6 &=u_5 - 2 = 10 - 2 = 8\;;& \\ u_7 &=u_6 - 2 = 8 - 2 = 6\;;& \\ u_8 &=u_7 - 2 = 6 - 2 = 4.& \end{aligned}\]

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