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Sagot :

Bonjour :)

Réponse en explications étape par étape :

- Question : Calculer :

- Exercice 32 :

a. - 3/10 * 5/12 = - 3/(5 * 2) * 5/(3 * 4) = - 1/(4 * 2) = - 1/8

b. 25/16 * - 12/15 = (5 * 5)/(4 * 4) - (4 * 3)/(3 * 5) = - 5/4

c. - 9/28 * 56/63 = - 9/(7 * 4) * (7 * 8)/(9 * 7) = - 8/28 = - 2/7

- Exercice 33 :

a. 5/7 * 1/3 * - 1/2 = - 5/42

b. - 3/5 * - 1/2 * - 2/7 = - 6/70

Voilà

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