收敛半径 R = lim
收敛域 x∈[-3,3)
S(x) = ∑
S'(x) = ∑
= ∑
= (1/3)/(1-x/3), x∈[-3,3)
S(x) = ∫<0, x> S'(t)dt +S(0)
= ∫<0, x> (1/3)dt/(1-t/3)
= -ln(1-x/3), x∈[-3,3)
∑
= -∑
= -S(-1) = ln(1+1/3) = 2ln2-ln3
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