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Sagot :

bonjour

3 * 4 x + 3 * 7 + 4 * 2 x - 9 *4

= 12x + 21 + 8 x - 36

= 12 x + 8 x + 21 - 36 = 20 x - 15

7 x * 2 x + 7 x * - 5 - x * 2x + x* 5

= 14 x ² - 35 x - 2 x ² + 5 x

= 14 x ² - 2 x ² - 35 x + 5 x

= 12 x² - 30 x

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