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- ex2 :
- 1) U5 = U0 + q*5 = 1944
- U8 = U0 + q*8 = 6561
- Donc U0 = 1944 - q*5 = 6561 - q*8
- 6561 - 1944 = q*8 - q*5
- 4617 = 3q
- q = 4617/3 = 1539
- Donc U0 = 6561 - 1539*8 = -5751
- Donc Un = -5751 * 1539*n
- 2) U8 = U5 * q^(8-5)
- U8/U5 = q^3
- q^3 = 6561/1944
- q^3 = 3,375
- q = 1,5
- U8 = U0 * q^8
- 6561 = U0 * 1,5^8
- U0 = 6561/(1,5^8)
- U0 = 256
- Donc Un = 256 * 1,5^n
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