Re: [中學] 請問一題多項式
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f(x) = Σa_k x^k
k
f(x^2 + 2) = Σ a_k (x^2 + 2)^k
k
= Σ Σ a_k C(k, p) x^(2p) 2^(k-p)
k p
f(x^2 + 2)偶項係數和 = f(3)
= 15
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