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Sagot :

Bonsoir,

a. 42= 2 x 21 = 2 x 3 x 7

b. 75 = 15 x 5 = 3 x 5 x 5 = 3 x 5²

c. 164 = 4 x 41 = 2 x 2 x 41 = 2² x 41

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