svvp aidez moi c pour demain voici la question:

1/supprimer les parenthéses puuis simplifier:

A= -(a-b)+(-b+c-a)
B= -(b-c)-(a-b-c)
C= -(a-b+c)-c+(-a-b)
D=2-(-a-b+c)-(b+a)-c

mercii
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