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Sagot :

AENA12
(+5)+(-7)+(+9)+(-8)+(+6) = (5+9+6) + (-7 -8) = 20 - 15 = 5 
                                    = 5 - 7 + 9 - 8 + 6 = 5 

(-3.4)+(+4.5)+(-8.9)+(+2.7) = (4.5 + 2.7) + (-3.4 -8.9) = 7.2 - 12.3 = -5.1
                                       = -3.4 + 4.5 - 8.9 + 2.7 = -5.1 
METHILA
(+5)+(-7)+(+9)+(-8)+(+6)= 5

(-3.4)+(+4.5)+(-8.9)+(+2.7)= 12.7

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