嚙複橘蕭嚙瘩again^n
2010-1-4 17:21
Justice
嚙複橘蕭嚙瘩again^n
a:
嚙踝蕭簡:
[u]2(3^n)-3^n-1[/u]
2(3^n-1)
b:
嚙複列3,9,18,30,...嚙踝蕭嚙踝蕭n嚙踝蕭嚙瞌?
2010-1-4 18:00
ZGF-2107
[quote]嚙趣帖嚙踝蕭 [i]Justice[/i] 嚙踝蕭 2010-1-4 17:21 嚙緻嚙踝蕭
a:
嚙踝蕭簡:
2(3^n)-3^[color=Red]n-1[/color]
2(3^[color=Magenta]n-1[/color])
b:
嚙複列3,9,18,30,...嚙踝蕭嚙踝蕭n嚙踝蕭嚙瞌? [/quote]
^n-1嚙磐n嚙踝蕭-1嚙緩-3n嚙踝蕭-1?
嚙瞑^嚙磐嚙罷=嚙踝蕭嚙踝蕭?
2010-1-4 18:05
ZGF-2107
嚙誹佗蕭嚙磐嚙罷6 n嚙踝蕭-4 n嚙踝蕭
4 n嚙踝蕭
=2嚙踝蕭1?
2010-1-4 18:08
嚙編嚙踝蕭
A"
[u]2(3^n)-3^n-1[/u]
2(3^n-1)
[u]2(3^n)-(3^n)(3^-1)[/u]
2(3^n)(3^-1)
[u][color=red](3^n)[/color](2-3^-1)[/u]
2[color=red](3^n)[/color](1/3)
[u]5/3[/u]
2/3
=2.5
B"
嚙踝蕭搵General Term...嚙豎改蕭
2010-1-4 18:16
chinlap
a.
5/2
b.
(3/2)((1+n)*n)
嚙瞌嚙豎我恬蕭p(嚙踝蕭)
2010-1-4 18:20
嚙編嚙踝蕭
[quote]嚙趣帖嚙踝蕭 [i]chinlap[/i] 嚙踝蕭 2010-1-4 18:16 嚙緻嚙踝蕭
a.
5/2
b.
(3/2)((1+n)*n)
嚙瞌嚙豎我恬蕭p(嚙踝蕭) [/quote]
嚙踝蕭嚙踝蕭嚙磐嚙罷嚙誹賂蕭嚙踝蕭
part b嚙踝蕭嚙踝蕭嚙踝蕭嚙皚:1276
2010-1-4 18:25
chinlap
[quote]嚙趣帖嚙踝蕭 [i]嚙編嚙踝蕭[/i] 嚙踝蕭 2010-1-4 18:20 嚙緻嚙踝蕭
嚙踝蕭嚙踝蕭嚙磐嚙罷嚙誹賂蕭嚙踝蕭
part b嚙踝蕭嚙踝蕭嚙踝蕭嚙皚:1276 [/quote]
please prove by contradiction, or trail and error, either you can close your mouth
(tea)
(think)
2010-1-4 18:41
嚙編嚙踝蕭
[quote]嚙趣帖嚙踝蕭 [i]chinlap[/i] 嚙踝蕭 2010-1-4 18:25 嚙緻嚙踝蕭
please prove by contradiction, or trail and error, either you can close your mouth
(tea)
(think) [/quote]
嚙誹可嚙瘡嚙踝蕭嚙篆嚙瘤[嚙趣走_嚙諂伐蕭
嚙踝蕭*嚙豎堆蕭^嚙瘤(嚙諛伐蕭
2010-1-5 23:21
Zerco
嚙稷嚙稻 #5 chinlap 嚙踝蕭嚙踝蕭嚙締
2(3^n)-3^n-1 =(3^n)(5/2)
2(3^n-1) = 2(3^n)(1/3)
?