一道高数关于级数的题目:这道题如果我是用比值判别法做,u(n+1)/u(n)的结果是ln(n+1)/ln(n+2) <1,这样不就成收敛的么?我错在哪了?
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![一道高数关于级数的题目:这道题如果我是用比值判别法做,u(n+1)/u(n)的结果是ln(n+1)/ln(n+2) <1,这样不就成收敛的么?我错在哪了?](/uploads/image/z/5559253-61-3.jpg?t=%E4%B8%80%E9%81%93%E9%AB%98%E6%95%B0%E5%85%B3%E4%BA%8E%E7%BA%A7%E6%95%B0%E7%9A%84%E9%A2%98%E7%9B%AE%EF%BC%9A%E8%BF%99%E9%81%93%E9%A2%98%E5%A6%82%E6%9E%9C%E6%88%91%E6%98%AF%E7%94%A8%E6%AF%94%E5%80%BC%E5%88%A4%E5%88%AB%E6%B3%95%E5%81%9A%2Cu%EF%BC%88n%2B1%EF%BC%89%2Fu%28n%29%E7%9A%84%E7%BB%93%E6%9E%9C%E6%98%AFln%28n%2B1%29%2Fln%28n%2B2%29++%26lt%3B1%2C%E8%BF%99%E6%A0%B7%E4%B8%8D%E5%B0%B1%E6%88%90%E6%94%B6%E6%95%9B%E7%9A%84%E4%B9%88%3F%E6%88%91%E9%94%99%E5%9C%A8%E5%93%AA%E4%BA%86%3F)
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