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因為 ln(1+x)=x-x²;/2+x³;/3-. x=1時,右邊數項級數=1-1/2+1/3-1/4+. 這個是交錯級數,它是收斂的 所以 x=1時收斂 但 x=-1時,右邊=-1-1/2-1/3-. =-(1+1/2+1/3+.) 這個是發散的 所以 收斂域為(-1,1】
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