Corrigé du 19 P. 44

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\[\begin{aligned} w_0 &= \frac 34\;;& \\ w_1 &= w_0 + r = \frac 34 + \frac 12 = \frac34 + \frac24 = \frac54\;;& \\ w_2 &= w_1 + r = \frac54 + \frac 12 = \frac54+\frac24 = \frac74\;;& \\ w_3 &= w_2 + r = \frac74 + \frac12 = \frac74 + \frac24 = \frac94.& \end{aligned}\]

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