[問題] 兩題數學 急>"<
第一題
50 1
Σ (──)
k=1 k
第二題
n 1 1
Σ (── + ──)
k=1 k k+1
已經想了一個禮拜了
我怎麼樣都找不到規律
跪求重考版神人幫解 感激不盡>"<
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