Exercice:
Sachant que a=-4, b=4, C=-2, d=-10, e=2 et f=7,
calculer :
A=4-a+b-c
B=-9+b-e-f+c
C=13-f-b+4-c+a+d
D=9-(4-a)+(-b+4)-(c-2)
E=-15+(7-b)-5-(-e-c)+(d-13)
F=19-(13-b)-(5-e+a-c)+(-f+8)
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