問題詳情

7.
(A) If both

and m are abolitely cnvergemt, than


(B) If

is convergent and

is divergent, then

must be divengent.
(C)Sugpose that f(x) is a positive and continuous function on [1,∞), and the improper integral

f(x) de is convergent. Let an = f(n), then

an is convergent.

n=1
(D) Ifan≤ bn for all n

is convergent, then

an must be convergent.  

參考答案

答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增