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æ¶æåå¾ R = lim(nââ) | an/an+1 | ï¼æ¶æåºé´ï¼-Rï¼Rï¼
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æ¶æåå¾ R = lim(nââ) | an/an+1 | = lim(nââ) | an/an+1 | =1
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