(1/(2²-1))+(1/(3²-1))+(1/(4²-1))+···+(1/((n²+1)-1))的和是多少等你们哦,亲,摸摸大.╭(╯3╰)╮
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![(1/(2²-1))+(1/(3²-1))+(1/(4²-1))+···+(1/((n²+1)-1))的和是多少等你们哦,亲,摸摸大.╭(╯3╰)╮](/uploads/image/z/8508505-49-5.jpg?t=%EF%BC%881%2F%282%26%23178%3B-1%29%EF%BC%89%2B%EF%BC%881%2F%283%26%23178%3B-1%EF%BC%89%EF%BC%89%2B%EF%BC%881%2F%EF%BC%884%26%23178%3B-1%EF%BC%89%EF%BC%89%2B%C2%B7%C2%B7%C2%B7%2B%EF%BC%881%2F%EF%BC%88%28n%26%23178%3B%2B1%29-1%EF%BC%89%EF%BC%89%E7%9A%84%E5%92%8C%E6%98%AF%E5%A4%9A%E5%B0%91%E7%AD%89%E4%BD%A0%E4%BB%AC%E5%93%A6%2C%E4%BA%B2%2C%E6%91%B8%E6%91%B8%E5%A4%A7.%E2%95%AD%28%E2%95%AF3%E2%95%B0%29%E2%95%AE)
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(1/(2²-1))+(1/(3²-1))+(1/(4²-1))+···+(1/((n²+1)-1))的和是多少等你们哦,亲,摸摸大.╭(╯3╰)╮
(1/(2²-1))+(1/(3²-1))+(1/(4²-1))+···+(1/((n²+1)-1))的和是多少
等你们哦,亲,摸摸大.╭(╯3╰)╮
(1/(2²-1))+(1/(3²-1))+(1/(4²-1))+···+(1/((n²+1)-1))的和是多少等你们哦,亲,摸摸大.╭(╯3╰)╮
(1/2)*(1-1/3+1/2-1/4+……+1/n-1-1/n+1)
(1/2)*(1+1/2-1/n-1/n+1)