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Sagot :

a. A(partie coloriee) = (23 - x) × (47-x)

A(...) = 1081 - 23x - 47x + x²

A(...) = x² -70× + 1081 m²

b. A =(23 - 14,7) × (47 - 14,7)

A= 8.3 × 32.3

A= 268.09 m²

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