記所求和為S
等式左邊求導結果整理為 -S/k,右邊為 -(k+1)/(k-1)^3
則所求之和為 S = k(k+1)/(k-1)^3
記所求和為S
等式左邊求導結果整理為 -S/k,右邊為 -(k+1)/(k-1)^3
則所求之和為 S = k(k+1)/(k-1)^3
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我想了半天才明白您的意思,謝謝!
-yma16-
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11/12/2018 postreply
21:48:57
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按照您的思路,要是把分子換成立方,也可以做。
-yma16-
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11/12/2018 postreply
21:53:07
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直接的解法
-yma16-
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11/13/2018 postreply
19:31:19
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