[中學] lim問題請教
肯請高手幫忙解釋一下吧~感謝!
lim ( 1/n^2 + 2/n^2 + 3/n^2 + ... + n/n^2 )
n→∞
(A)
= lim (1/n^2) + lim (2/n^2) + ... + lim (n/n^2)
n→∞ n→∞ n→∞
(B)
= 0 + 0 + 0 + ... + 0
(C)
= 0
請問錯在哪個等號? 麻煩說明理由~ 出版社給的答案是(C)
我查到一題類似的
試在下列的計算式中,指出開始錯誤的地方
lim(n!/n^n)
n→∞
(A)
= lim [ (n/n) * ( n-1 / n ) * ...* (2/n) * (1/n) ]
n→∞
(B)
= lim(n/n) * lim( n-1 / n ) * ...* lim(2/n) * lim(1/n)
n→∞ n→∞ n→∞ n→∞
(C)
= 1 * 1 * ... * 0 * 0
(D)
= 0 這題答案是(B)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 125.229.81.11
→
03/07 23:42, , 1F
03/07 23:42, 1F
推
03/07 23:42, , 2F
03/07 23:42, 2F
→
03/07 23:43, , 3F
03/07 23:43, 3F
→
03/07 23:47, , 4F
03/07 23:47, 4F
→
03/07 23:48, , 5F
03/07 23:48, 5F
推
03/07 23:49, , 6F
03/07 23:49, 6F
→
03/07 23:51, , 7F
03/07 23:51, 7F
→
03/07 23:51, , 8F
03/07 23:51, 8F
→
03/07 23:56, , 9F
03/07 23:56, 9F
→
03/08 00:12, , 10F
03/08 00:12, 10F
推
03/08 00:25, , 11F
03/08 00:25, 11F
→
03/08 00:48, , 12F
03/08 00:48, 12F
→
03/08 00:49, , 13F
03/08 00:49, 13F
→
03/08 00:49, , 14F
03/08 00:49, 14F
→
03/08 00:50, , 15F
03/08 00:50, 15F
推
03/08 01:16, , 16F
03/08 01:16, 16F
→
03/08 01:16, , 17F
03/08 01:16, 17F
推
03/08 18:35, , 18F
03/08 18:35, 18F