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Sagot :

1) U1 = -1
U2 = -7
U3 = -13

2) Un+1 = Un - 6

3) Un = U0*nr
U12 = 5 * 12 * (-6)
U12 = - 360

Un = U0*nr
U33 = 5* 33* (-6)
U33 = -990



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