8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算

学习时间:2026-11-13 05:25:21 阅读：2510

8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算8-2/3-2/15-2/35-2/63-2/99-2/143-2/195-2/255 巧算

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2026-11-13 05:25:21

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=8-(1-1/3)-(1/3-1/5)-(1/5-1/7)-(1/7-1/9)-(1/9-1/11)-(1/11-1/13)-(1/13-1/15)-(1/15-1/17)=8-1+1/17=7+1/17=120/17