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过年没事出道题大家玩玩
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程序员 - @zealot0630 - 求证：任意有理数能表示为有限个 1/n 之和，比如2 = 1/1 + 1/2 + 1/3 + 1/64/5 = 1/2 + 1/4 + 1/2010/7 = 1/1 + 1/3
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