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Meilleure réponse !
2013-05-22T14:44:34+02:00

Ex01:
A = x² - 6x - 7 - 3x² + 8x + 35 = -2x² + 2x + 28
B = 35x² - 11x - 6 - 5x² + 39x - 8 = 30x² + 28x - 14

 

Ex02:
C = 4x(a + 2b)
D = (3 - 2x)(5 - x - 7 + 4x) = (3 - 2x)(3x - 2)

 

Ex03:
1. pour x=3, E = -12 - 5 - 30 - 8 = -55
2. E = 3x - 21 + 5x - 20 - 6x - 12 - 4x + 4 = -2x - 49
3. pour x=3, E = -6 - 49 = -55

 

Ex04:
1) x = 6 - 4 = 2
2) x = 4 - 2 = 2
3) 3x - x = 6
          2x = 6
            x = 3
4) 6x + x = 3 - 1
           7x = 2
             x = 2/7
5) x = 18
6) x = 6/3 = 2

 

Ex05:
(318 - 24)/42 = 7 personnes