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Exercice 1 donner le signe ded expression sans les calculer.Justifier chaque réponse.

a) -3,6×24,6×(-5,5)
b)13,7×(-1,6)×(-4,9)×(-0,5)
c) -1,25×4,5×(-15)×4

Exercice 2 même chose

a) -12×(-3,4)×(-5)×(-0,6)×(-2,9)
b) 12×(-2,8)×(-0,5)×10,7×(-5,8)
c) -12×43,1×(-15)×(-0,1)×(-7,1)
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