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1 transparent par page - Montefiore

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Décou<strong>page</strong> + glissement de 2 unités vers la gauche :<br />

2<br />

> 2<br />

20<br />

> 2<br />

19 2<br />

◮ Aire du petit rectangle : > 4.<br />

20<br />

> 2<br />

2<br />

> 2<br />

◮ Aire du grand rectangle : > (20 + 2) × 19 = 418.<br />

19<br />

> 2<br />

◮ ⇒ Aire totale : > 422. Par conservation d’aire, on a donc<br />

420 > 422.<br />

31

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