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Sagot :

Bonjour,

distributivité.....

3(2x+5) = 3*2x + 3*5 = 6x + 15

12(3-5x) = 12*3 - 12*5x = 36 - 60x

2x(x-9) = 2x*x - 2x*9 = 2x² - 18x

-3x(2x+7x) = -3x(9x) = -27x²

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