Réponses/Explications étape par étape :
a. 3 = 3 x = 3 x x = 3 x 3 x = 9
b.- = -1 x = -1 x x = -1 x 2 x = -2
c. 5 = 5 x = 5 x x = 5 x 2 x = 10
d. -3 = -3 x = -3 x x = -3 x 7 x = -21
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Réponses/Explications étape par étape :
a. 3
 = 3 x 
= 3 x 
 x 
 = 3 x 3 x
 = 9
 
b.-
 = -1 x 
 = -1 x  
 x 
 = -1 x 2 x
 = -2
 
c. 5
 = 5 x 
 = 5 x  
 x 
 = 5 x 2 x
 = 10
d. -3
 =  -3 x 
= -3 x 
 x 
 = -3 x 7 x
 = -21