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Sagot :

Bonjour,

1) a) 65/100 × 5/13 = (13×5×5)/(100×13) = 25/100 = 1/4

  b) 100/100 - 65/100 - 25/100 = 10/100 = 1/10

2) a) 68 × 1/4 = 17

   b) 68 × 9/10 = 61,2

3) montant × 1/4 = 5,75 donc montant = 5,75 ÷ 1/4 = 23

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