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une écriture plus simple des expressions 2011-01-13
From jessie:

trouver une écriture plus simple des expressions suivantes sachant que : x + y = 3 et x - y =-2
A=x-1+y+2             B=x-1+y-2
C=x+1+y+2            C=x+1+y-2


Answered by Claude Tardif.
 
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