Réponses

2013-11-11T17:45:03+01:00
21x286-[25x(234-2x13)]
6006-[25x(234-26)]
6006-(25x208)
6006-5200=806
2013-11-11T17:47:36+01:00
 21x286-[25x(234-2x13)]
= 21*286-[25x(234-26)]
= 21*286-[25x208]
= 21*286-5200
= 6006-5200
= 806