Corrigé du 20 P. 44
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\[\begin{aligned} t_1 &= -3\;;& \\ t_2 &= t_1 + r = -3 + 3 = 0\;;& \\ t_3 &= t_2 + r = 0 + 3 = 3\;;& \\ t_4 &= t_3 + r = 3 + 3 = 6.& \end{aligned}\]