Blogtrottr
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中 
Refresh your vocabulary.

Learn a new word everyday by subscribing to Word of the Day. A great tool if you're studying for the GRE, GMAT or LSAT, or simply want to enhance your lexicon.
From our sponsors
一個規律數列是否碰整數數學問題
Aug 21st 2013, 05:22

(1) 分子: 10,17,26,37,50,....

第1級差: 7,9,11,13,.....

第2級差: 2,2,2,...

第2級公式:

an=a+(n-1)d1+(n-1)(n-2)d2/2

=10+(n-1)7+(n-1)(n-2)2/2

=10+(n-1)(7+n-2)

=10+(n-1)(n+5)

=n^2+4n+5

(2) 分母: 3,5,7,9,11,.....

bn=2n+1

(3) 合併

cn=an/bn=(n^2+4n+5)/(2n+1)

c6=(36+24+5)/13=65/13=5........ans

第6項剛好整數=5


This entry passed through the Full-Text RSS service — if this is your content and you're reading it on someone else's site, please read the FAQ at fivefilters.org/content-only/faq.php#publishers. Five Filters recommends: 'You Say What You Like, Because They Like What You Say' - http://www.medialens.org/index.php/alerts/alert-archive/alerts-2013/731-you-say-what-you-like-because-they-like-what-you-say.html
You are receiving this email because you subscribed to this feed at blogtrottr.com.

If you no longer wish to receive these emails, you can unsubscribe from this feed, or manage all your subscriptions
arrow
arrow
    全站熱搜
    創作者介紹
    創作者 pkoos 的頭像
    pkoos

    韓劇中字《奶酪陷阱》EP02 第二集韓劇奶酪陷阱(捕鼠器裡的奶酪)線上看劇集列表 乳酪陷阱線上看,乳酪陷阱線上收看,乳酪陷阱劇情,乳酪陷阱結局,乳酪陷阱演員

    pkoos 發表在 痞客邦 留言(0) 人氣()

    E-mail轉寄