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x1+x2 = -b/a
= - k²-3k+12 ..pers 1
x1.x2 = c/a
= 2k-1 ..pers 2
k²-2k+1 = 0
(k-1)² = 0
k = 1
pers 1 : x1+x2 = -1²-3+12
= 8
pers 3 :
Sn = x1+k+x2
= (√15+4)+1+(4-√15)
= 9
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