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Sagot :

Bonsoir,

72 ÷ 2 = 36

36 ÷ 2 = 18

18 ÷ 2 = 9

 9 ÷ 3 = 3

donc 72 = 2 × 2 × 2 × 3 × 3  = 2³ × 3²

72=2*36
36=2*18
18=2*9
9=3*3=1
Donc 72=2*2*2*3*3

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