Exercice: 1 a)  ( +2) x (+3)   b) (-2) x 3
 c) 5 x -(7)   d) (-7) x (-5)

Exercice 2: a)(- 0,2) x (- 13)    b) (-0,2) x 13
                   c) 0,5 x (-0,7)      d) (-7) x (-0,5)

MERCI c'est vraiment urgent!
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