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Sagot :

MOZI

Bonsoir,

Aire(BCDE) = d.(11-d) = 11d - d²

Aire(BCDE) = 121/4 ⇔ d² - 11d + 121/4 = 0

⇔  d² - 2 * 11/2 * d + (11/2)² = 0

⇔ (d - 11/2)² = 0

⇔ d = 11/2 = 5,5 cm

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