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Sagot :

Bonjour,

B = 9(14 - 7y)

B = 9 * 14 + 9 * (-7y)

B = 126 - 63y

B = - 63y + 126

C = -3(-7 - 4b)

C = -3 * (-7) - 3 * (-4b)

C = 21 + 12b

C = 12b + 21

D = 4z(5z + 9y)

D = 4z * 5z + 4z * 9z

D = 20z² + 36zy

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