Supprimer les parenthèses puis réduire chaque expressions a= 50-(x + 20)
b= -(3-x + x au carré ) + (-2x + 3x au carré - 8)
C= (10+a) - (5-a)
d= -(10+a) + ( a-5)
e=50-(20-x)
MERCI
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