※ 引述《justin0602 (justin)》之銘言:
: 已知f(x)為一100次多項式
: 且 f(k)=1/k , k=1,2,3,...........100,101
令 g(x) = x f(x), 則 deg(g(x)) = 101
且 g(k) = 1, k=1,2,3,...........100,101.
因為 g(x) 常數項為 0, 故
g(x) = (x-1)(x-2)....(x-101)/101! + 1
: 則f(102)=?
: ANS:1/51
g(102) = 101!/101! + 1 = 2 = 102 f(102)
f(102) = 1/51
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◆ From: 163.22.18.20