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Sagot :

Réponse :

a) R.1

Explication : 5 x 3 + 10 x 5 + 15 x 2 / 3 + 5 + 2 = 95/10 = 9,5

b) R.1

Explication : 5 x 3 + 10 x 5 + 15 x 2 + x x 10 / 3 + 5 + 2 + 10 = 20

⇔ 95 + 10x / 20 = 20

⇔ 95 + 10x = 400

⇔ 10x = 305

⇔ x = 30,5

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