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1/2+1/6+1/12+1/20+1/30+1/42=

学习时间:2026-04-04 18:53:33 阅读：6200

1/2+1/6+1/12+1/20+1/30+1/42=

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激动的鱼

震动的白昼

2026-04-04 18:53:33

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1/2+1/6+1/12+1/20+1/30+1/42=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7=1-1/7=6/7 我是老师谢谢采纳

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知性的抽屉
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2026-04-04 18:53:33
1/2+1/6+1/12+1/20+1/30+1/42=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7=1-1/7=6/7 我是老师谢谢采纳

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