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{xn}n!N x1 = 2, xn+1 = 2xn xn + 1 n ! 1 1 an a1 = 1, an+1 = ! 9 + a2n 2 n ! 1 3 ĺım n"# " 1 n2 " n + 1 + 1 n2 " n + 2 + . . . + 1 n2 " n + n # 0 ĺım n"# " 1 n # n2 + 1 + 2 n # n2 + 2 + . . . + n n # n2 + n # 1 2 ĺım n"# " 1 n2 + 1 (n + 1)2 + . . . + 1 (2n)2 # 0 ĺım n"# " 1 n # n + 1 n # n + 1 + . . . + 1 n # 2n # 0 ĺım n"# " n n + 1 #n e$1 ĺım n"# " n" 1 n + 3 #n+2 e$4 ĺım n"# " 1 + 1 n + 1 #4n e4 ĺım n"# " an + b an + c #n e b!c a {an}n!N an > 0 $n % N ĺım n"# an+1 an = l < 1 ĺım n"# an = 0 ĺım n"# 2n n ĺım n"# n nn ĺım n"# an = l ĺım n"# |an| = |l|
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