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Sagot :

21x286-[25x(234-2x13)]
6006-[25x(234-26)]
6006-(25x208)
6006-5200=806
 21x286-[25x(234-2x13)]
= 21*286-[25x(234-26)]
= 21*286-[25x208]
= 21*286-5200
= 6006-5200
= 806

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