Correction des exercices. Exercice 1. A = 5x+ 3x. B = - 4 x + 15 x . C = 3x - 8x . D = - 9x - 6x . A = (5 + 3) x x . B = (- 4 + 15) x x . C = 3 x + (- 8 x ). D = - 9 x + (- 6 x ). A=8x. B = 11 x . C = [3 + (- 8)] x x . D = [- 9 + (- 6)] x x . C= - 5 x...
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Correction des exercices. Exercice 1. A = 5x+ 3x. B = - 4 x + 15 x . C = 3x - 8x . D = - 9x - 6x . A = (5 + 3) x x . B = (- 4 + 15) x x . C = 3 x + (- 8 x ). D = - 9 x + (- 6 x ). A=8x. B = 11 x . C = [3 + (- 8)] x x . D = [- 9 + (- 6)] x x . C= - 5 x . D = - 15 x . Exercice 2. A = 12 x - y + 2. B = 7y + 12 – 13y. C = 10 – 8d + 3. B = 7y + 12 + (– 13y). C = 10 + 3 – 8d. B = 12 + 7y + (– 13y). C = 13 – 8d. B = 12 + (– 6y). B = 12 – 6y. D = 8 - x + x ² + 5 x . E = 3t – 12t + t² - 7. F = a² + b – a + 3b. D = 8 + (-1 x ) + x ² + 5 x . E = 3t + (– 12t) + t² - 7. F = a² - a + 1b + 3b. D = 8 + (-1 x ) + 5 x + x ². E = – 9t + t² - 7. F = a² - a + 4b. D = 8 + 4 x + x ². Exercice 3. Remarque. Le rectangle a pour dimensions x et 5 + 3 x . 1) a) Calcul du périmètre L1 du rectangle. Calcul du périmètre L2 de l’hexagone. L1 = 2 x x + 2 x (5 + 3 x ). L2 = 8 x + 2 x (5 - x ). L1 = 2 x + 2 x 5 + 2 x 3 x . L2 = 8 x + 2 x 5 - 2 x x . L1 = 2 x + 10 + 6 x . L2 = 8 x + 10 - 2 x . L1 =
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