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Sagot :

31 : 

M = 2/5

N = 5/6

P = 4/9

Q = 7/9

 

34:

A-    7/3 * 3/7 = 21/21         d'ou 7/3 * 3/7 = 1

B-    4/5 * 5/4 =1

C-    6/11 * 11/6 =1

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