April 2019 2 142 Report
Dans chaque cas, sans calculer le produit déterminer son signe.

a) (- 5 ) x (- 6 ) x 7 ;
b) 5 x ( -6 ) x ( - 7 ) x ( - 8 ) ;
c) ( - 5 ) x ( - 6 ) x ( - 7 ) x ( - 8 ) x ( - 9 ) ;
d) 5 x ( - 6 ) x ( - 7 ) x ( - 8 ) x ( - 9 )

Merci de m'aider
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