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这道题为什么是积分呐？不是等比数列求和吗？

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<p>这道题为什么是积分呐？不是等比数列求和吗？</p><p><img src="https://i1.hoopchina.com.cn/hupuapp/bbs/96446077870539/thread_96446077870539_20201107133400_s_60995_o_w_1126_h_349_69910.jpg" data-h="349" data-w="1126" data-imgid="2a97f103fbd637f7aaaf2342df5c929d"/></p>

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