Pouvait vous maider svp calculer les expression suivante  (retirer les parenthese quand cela est possible )
a=-3+5-2+1=
b=5-4+2-6=
c=-6+5-4+3-2-1+7=
d=12-7+(-6)-(-13)+(-12)=
e=(3-5)+(1-4+6)-(-2+9)=
f=2-(5+7-3)-9(-3+6)=
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