2008-10-29 07:18 PM
ChUnG聰‵
急!!!!!問maths..[重重有賞!!]
教我F.3 Ch1複習1第21題(c)吖(要步騾)
ThX!!!!!!!!!
[重重有賞!!]
[[i] 本帖最後由 ChUnG聰‵ 於 2008-10-29 07:29 PM 編輯 [/i]]
2008-10-29 07:45 PM
`乜囧.
簡單到脫褲-3-
9(2^2n)-3(2^n+1)/5(2^n-1)
=9(2^n+n)-3(2^n+1)/5(2^n-1)
=18(2^n)-12/5 <<<搬個2^n-1上去=2^n+1-n+1=2^2
2008-10-29 08:03 PM
夢想幻滅
(2^n+n)、(2^n+1)、(2^n-1)點整到
(2^n),可列步驟嗎????
2008-10-29 08:08 PM
`乜囧.
回覆 #3 夢想幻滅 的帖子
9(2^n+n)-3(2^n+1)/5(2^n-1)
=9(2^n+n)-3(2^n+1-n+1)/5
=9(2^n+n)-3(2^2)/5
=9(2^n+n)-12/5
之後唔記得- -1個月前做的野唔記得-,-
2008-10-29 08:11 PM
夢想幻滅
「9(2^n+n)-12/5」
就係做到呢到唔明= = '
2008-10-29 08:14 PM
ChUnG聰‵
[img=662,561]http://dicksonheung.googlepages.com/maths001.png[/img]
2008-10-29 08:26 PM
`mR.H0
[quote][b]原帖由 [i]joemike188[/i] 於 2008-10-29 07:45 PM 發表。 [/b][url=http://forum.eyankit.com/viewthread.php?tid=29782&page=1#pid281893][img]http://forum.eyankit.com/images/common/back.gif[/img][/url]
簡單到脫褲-3-
9(2^2n)-3(2^n+1)/5(2^n-1)
=9(2^n+n)-3(2^n+1)/5(2^n-1)
=18(2^n)-12/5 <<<搬個2^n-1上去=2^n+1-n+1=2^2 [/quote]
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