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Aug 13th, 2017
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  1. ex2 :
  2.  
  3. 1) U5 = U0 + q*5 = 1944
  4. U8 = U0 + q*8 = 6561
  5. Donc U0 = 1944 - q*5 = 6561 - q*8
  6. 6561 - 1944 = q*8 - q*5
  7. 4617 = 3q
  8. q = 4617/3 = 1539
  9. Donc U0 = 6561 - 1539*8 = -5751
  10.  
  11. Donc Un = -5751 * 1539*n
  12.  
  13.  
  14. 2) U8 = U5 * q^(8-5)
  15. U8/U5 = q^3
  16. q^3 = 6561/1944
  17. q^3 = 3,375
  18. q = 1,5
  19.  
  20. U8 = U0 * q^8
  21. 6561 = U0 * 1,5^8
  22. U0 = 6561/(1,5^8)
  23. U0 = 256
  24.  
  25. Donc Un = 256 * 1,5^n
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