Bonjour, quelqu'un peut me corriger svp :
A = 9 + ( x - 2)
= 9 + x - 2
= 9 + 2x
B = 7 - ( 3 -2x )
= 7 - 3 - 2x
= 4 - 2x
C = 3 - x + 1
= 3 - 1x
D = 3 - ( -x + 1 )
= 3 - ( -1x )
C'est juste ?
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