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VINS

bonjour

8² = 64

aire grand carré = 64 cm²

aire petit carré = x²

aire restante = 64 - x²

- x² + 64 = 15

- x² = 15 - 64

- x² = - 49

x² = 49

x = √49 ou - √49

x = 7 ou - 7

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