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X X
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N N
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N
483
10 = 48.3
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N
N
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N
N N
N
S
S N N
S N N
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N
N 1 N 1000
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X (X 1) (X+ 1) X+ (X1) + (X+ 1) = 3 X N 3 X=N
N
N X N/3
N
N N
N X N
X (X+ 1) X (X 1)
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T T+ D T+ 2 D
M
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T , D , M (1 T , D 100, 1 M 1000)
D M
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A1, A2, . . . AN N A1 AN
Ri i
Ri=
3 A1, i
3 A2+ 2 A1, i
3 Ai+ 2 Ai1+ Ai2, i > 2
N
N 1 N 100 N A1, A2, . . . AN 1 Ai 100
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N R1, R2, . . . RN N
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n n 1 n i (2 i 1) 1
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1 1 n(n >1)
n 1 n n n
n(1 n 100)
n
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n k n k
k k i 2i 1
i (n i)
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105
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