Effectuer en détaillant les etapes: a=(+7)-(-6=+(-12)-(+7)
b=(+19)+(+7)-(-1)+(-9)
c=(+7.4)+(-12.1)-(-8.6)-(+6.9)+(+4.5)
d=[ (-3)+(-1)-(-2)]-[(-5)-(+4)+(-9)]
bonjour j ait besoin d aide svp
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