#1
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1.¡Ó˹´ãËé A={a} , B ={$\varnothing$ ,b}, C ={$\varnothing$,a,b,c,d,e,f}¨Ó¹Ç¹¢Í§à«µ X â´Â·Õè $A \cup B \not\subset X$ áÅÐ $X\subset A \cup B \cup C $ Áըӹǹà·èÒäà (112 ૵) 2. ¡Ó˹´ãËé A = {$\varnothing$,{$\varnothing$},2,{$\varnothing$,{2},{$\varnothing$,2}}} ¾Ô¨ÒóҢéͤÇÒÁµèÍ仹Õé ¡. {2,{$\varnothing$},{$\varnothing$,{2}}} $\subset$ A ¢. {$\varnothing$,{2},{$\varnothing$,2}}$\in$ P(A) ¤. {$\varnothing$,{{$\varnothing$}},{$\varnothing$,{$\varnothing$},2}}$\subset$ P(A) §. {{$\varnothing$}} à»ç¹ÊѺ૵á·é¢Í§ A ÁÕ¢éͤÇÒÁ·Õèà»ç¹¨ÃÔ§·Ñé§ËÁ´¡Õè¢éÍ (3 ¢éÍ) 27 ÊÔ§ËÒ¤Á 2010 16:01 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ -Math-Sci- à˵ؼÅ: latex* |
#2
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¢éÍáá¼ÁÇèÒµéͧãªé¡ÒèѴËÁÙè´éÇ¡ç´Õ ËÃ×Íãªé¡ÒÃá¡é⨷ÂìẺÊÒÁÑÊÓ¹Ö¡¡çä´é
Åͧà¢Õ¹$A\cup B = \left\{\,a,b,\varnothing \right\} $ ÊÓËÃѺ$A\cup B\cup C = C$ à¾ÃÒÐÇèÒ$A\subset C$ áÅÐ$B\subset C$ $A\cup B\cup C = C = \left\{\,\varnothing ,a,b,c,d,e,f\right\} $ ¡Ó˹´ãËé $A \cup B \not\subset X$ áÅÐ $X\subset A \cup B \cup C $ àÃÒ¨ÐÊÃéҧ૵$X$ä´é¨Ò¡ÊÁÒªÔ¡·Õèà»ç¹ÊÁÒªÔ¡¢Í§ $A \cup B \cup C $ áµè$A \cup B$äÁèà»ç¹ÊÁÒªÔ¡¢Í§$X$ àÍÒÇÔ¸Õ§èÒÂæ¡è͹àÅ ¡ç¨Ñ´µÒÁ¨Ó¹Ç¹ÊÁÒªÔ¡¢Í§à«µ 1.ÁÕÊÁÒªÔ¡1 µÑÇ....àÅ×Í¡¨Ò¡$\left\{\,a,b,\varnothing,c,d,e,f\right\} $ ä´é 7 ૵ à¾ÃÒÐ$X=\left\{\,a\right\},\left\{\,b\right\} ,\left\{\,\varnothing \right\} \subset A \cup B \cup C $ áµè$A\cup B \not\subset X$ 2.ÁÕÊÁÒªÔ¡ 2µÑÇ....áºè§à»ç¹ 2.1µÑÇ˹Öè§ÁÒ¨Ò¡$\left\{\,a,b,\varnothing \right\} $ áÅÐÍÕ¡µÑÇÁÒ¨Ò¡$\left\{\,c,d,e,f\right\} $ ä´éà·èҡѺ $3\times 4 = 12$ ૵ 2.2·Ñé§ÊͧµÑÇÁÒ¨Ò¡$\left\{\,c,d,e,f\right\} $ ä´éà·èҡѺ$6$ ૵ 3.ÁÕÊÁÒªÔ¡ 3µÑÇ....áºè§à»ç¹ 3.1ÊͧµÑÇÁÒ¨Ò¡$\left\{\,a,b,\varnothing \right\} $ áÅÐÍÕ¡µÑÇÁÒ¨Ò¡$\left\{\,c,d,e,f\right\} $ ...¹Ñ觷ÓáÅéÇ·èÒ·Ò§¨ÐÂÒÇáÅÐÂØè§ÂÒ¡ÁÒ¡¢Öé¹àÁ×èͨӹǹÊÁÒªÔ¡ÁÒ¡¢Öé¹àÃ×èÍÂæ ¶éÒµéͧ·Ó仨¹¶Ö§ÊÁÒªÔ¡7µÑÇ ¼Á¤§µÒÂ仡è͹ ÇÔ¸Õ·ÕèÅÑ´¡ÇèÒ¤×ÍàÃÒÃÙéáÅéÇÇèҨӹǹ૵·Õèà»ç¹ÊѺ૵¢Í§$A\cup B\cup C = 2^7$ ૵ 㹨ӹǹ·Ñé§ËÁ´¨ÐÁÕ·Ñé§à«µ·ÕèÁÕ$A\cup B$à»ç¹ÊѺ૵¡Ñºà«µ·ÕèäÁèÁÕ$A\cup B$à»ç¹ÊѺ૵ $2^7=$ ૵·ÕèÁÕ$A\cup B$à»ç¹ÊѺ૵¡Ñºà«µ·ÕèäÁèÁÕ$A\cup B$à»ç¹ÊѺ૵ ¨Ó¹Ç¹à«µ·ÕèÁÕ$A\cup B$à»ç¹ÊѺ૵$ = 16$ àÃÒÊÃéҧ૵¹Õéâ´ÂÁÕÊÁÒªÔ¡àÃÔèÁµé¹¤×Í $ \left\{\,a,b,\varnothing \right\} $ ¨Ò¡¹Ñé¹ËÂÔºÊÁÒªÔ¡à¾ÔèÁÁÒ¨Ò¡$\left\{\,c,d,e,f\right\} $ â´ÂËÂÔºµÑé§áµèäÁèàÅ×Í¡àÅ«Ö觡ç¤×Í$A\cup B$¹Ñè¹àͧ µèÍÁÒ¤×ÍËÂÔº·ÕÅÐ1,·ÕÅÐ2,·ÕÅÐ3áÅзÕÅÐ4 «Öè§àÃÒÁÕÊÙµÃÇèÒàÃÒàÅ×Í¡ËÂÔº¢Í§$n$ªÔé¹â´ÂàÅ×Í¡ËÂÔº 0 ªÔé¹,1ªÔé¹,2ªÔé¹,...,仨¹¶Ö§$n$ªÔé¹ ¨ÐàÅ×Í¡ä´é·Ñé§ËÁ´$2^n$ ´Ñ§¹Ñé¹àÃÒ¨Ö§ä´é·Ñé§ËÁ´$2^4 = 16$૵ ¨Ó¹Ç¹à«µ·ÕèäÁèÁÕ$A\cup B$à»ç¹ÊѺ૵$2^7- 16 =128-16 = 112$
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"¶éÒàÃÒÅéÁºèÍÂæ ã¹·ÕèÊØ´àÃÒ¨ÐÃÙéÇèÒ¶éÒ¨ÐÅéÁ ÅéÁ·èÒä˹¨Ðà¨çº¹éÍ·ÕèÊØ´ áÅÐÃÙéÍÕ¡ÇèÒµèÍä»·ÓÂѧ䧨ÐäÁèãËéÅéÁÍÕ¡ ´Ñ§¹Ñ鹨§ÍÂèÒ¡ÅÑÇ·Õè¨ÐÅéÁ"...ÍÒ¨ÒÃÂìÍӹǠ¢¹Ñ¹ä·Â ¤ÃÑé§áá㹪ÕÇÔµ·ÕèÊͺ¤³ÔµÊÁÒ¤Á¤³ÔµÈÒʵÃìàÁ×èÍ»Õ2533...¼Áä´éá¤è24¤Ðá¹¹(¨Ò¡ÃéͤÐá¹¹) 27 ÊÔ§ËÒ¤Á 2010 18:42 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 4 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¡ÔµµÔ |
#3
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¶éÒãªéÊٵà ÃٻẺ·ÑèÇ令×Í
¡Ó˹´ãËé$ A,B,X$ à»ç¹à«µã´æ ¶éÒ $A\not\subset X\subset B$ ¨Ó¹Ç¹ÊѺ૵¢Í§ $X$ ¨Ðà·èҡѺ $2^{n(B)} - 2^{n(B)-n(A)}$ ૵ á·¹¤èÒŧ仨Ðä´éÇèÒ $2^7 - 2^{7-3} = 128 - 116 = 112$ ૵
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Fortune Lady
27 ÊÔ§ËÒ¤Á 2010 18:03 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ Siren-Of-Step |
#4
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¢éÍ 2 ¼Áä´é 2 ¢éÍÍèФÃѺ
¡. $\{2,\{∅\},\{∅,\{2\}\}\}\subset A$ $\therefore 2,\{∅\},\{∅,\{2\}\}\in A$ ¼Ô´à¾ÃÒÐ $\{∅,\{2\}\}\not\in A$ ¢. $\{∅,\{2\},\{∅,2\}\}\in A$ $\therefore \{∅,\{2\},\{∅,2\}\}\not\in P(A)$ ¢é͹Õé¡ç¼Ô´ ¤. $\{∅,\{\{∅\}\},\{∅,\{∅\},2\}\}\subset P(A)$ $\therefore ∅,\{\{∅\}\},\{∅,\{∅\},2\}\in P(A)$ ¶Ù¡µéͧ §. $\{\{∅\}\}$ à»ç¹ÊѺ૵á·é¢Í§ A ¶Ø¡µéͧ
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¤³ÔµÈÒʵÃì ¤×Í ÀÒÉÒÊÒ¡Å ¤³ÔµÈÒʵÃì ¤×Í ¤ÇÒÁÊǧÒÁ ¤³ÔµÈÒʵÃì ¤×Í ¤ÇÒÁ¨ÃÔ§ µÔ´µÒÁªÁ¤ÅÔ»ÇÕ´ÕâÍä´é·Õèhttp://www.youtube.com/user/poperKM 27 ÊÔ§ËÒ¤Á 2010 21:52 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 6 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ poper |
#5
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ÍéÒ§ÍÔ§:
àÅÂäÁèá¹èã¨ÇèÒà©Å¼ԴÃÖà»ÅèÒ ? |
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