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#1
17 µØÅÒ¤Á 2008, 17:39
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¢éÍÊͺÊÍǹ.¤èÒÂ1
1.ãËé $AB$ áÅÐ $CD$ à»ç¹àÊ鹵çÊͧàÊé¹·Õ袹ҹ¡Ñ¹ µèÍ $AD$ áÅÐ $BC$ µÑ´¡Ñ¹·Õè¨Ø´ $O$ áºè§¤ÃÖ觴éÒ¹ $BC$áÅÐ$AD$ ·Õè$E$áÅÐ$F$ µÒÁÅӴѺ µèÍ $EF$ ¶éÒ$CD$ÂÒÇà»ç¹Êͧà·èҢͧ$AB$áÅéÇ ¨§áÊ´§ÇèÒ$AB$ÂÒÇà»ç¹Êͧà·èҢͧ$EF$
2.ÊÕèàËÅÕèÂÁ $ABCD$ à»ç¹ÊÕèàËÅÕèÂÁã´æ Áըش $E,F,G,H$ à»ç¹¨Ø´¡Ö觡ÅÒ§´éÒ¹ $AB,BC,CD,AD$ µÒÁÅӴѺ ¨§¾ÔÊÙ¨¹ìÇèÒ ÊÕèàËÅÕèÂÁ $EFGH$ à»ç¹ÊÕèàËÅÕèÂÁ´éÒ¹¢¹Ò¹ áÅÐ ÁÕ¾×é¹·Õèà»ç¹¤ÃÖè§Ë¹Ö觢ͧÊÕèàËÅÕèÂÁ $ABCD$ ªèÇ·Ó˹è͹ФÃѺ 
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#2
17 µØÅÒ¤Á 2008, 17:55
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¢éÍáá ÅͧÇÒ´ÃÙ»¨Ò¡¢éÍÁÙÅ⨷Âì´Õæ áÅéǨÐÃÙéÇèÒ $EF$ ¨ÐµéͧÍÂÙèá¹Çä˹ ·ÕèàËÅ×ͤ×ÍÊÒÁàËÅÕèÂÁ¤ÅéÒ¤ÃѺ
¢éÍËÅѧ ÅÒ¡àÊé¹á·Â§ÁØÁ $AC,\ BD$ áÅéÇãªéÊÒÁàËÅÕèÂÁ¤ÅéÒ¤ÃѺ
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¤¹ä·ÂÃèÇÁã¨ÍÂèÒãªéÀÒÉÒÇÔºÑµÔ ½Ö¡¾ÔÁ¾ìÊÑÅѡɳìÊÑ¡¹Ô´ ªÕÇÔµ(¤¹µÍºáÅФ¹¶ÒÁ)¨Ð§èÒ¢Öé¹àÂÍÐ (¨ÃÔ§æ¹Ð) Stay Hungry. Stay Foolish.
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#3
17 µØÅÒ¤Á 2008, 21:08
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¢éÍ 2. ÅͧµÒÁä»´Ù·Õè ÅÔ§¤ì¹Õé¤ÃѺ
¢éÍ 1. µéͧÃÐÇѧàÃ×èͧ¡ÒáÓ˹´µÓá˹觢ͧ A,B,C áÅÐD äÁèàªè¹¹Ñ鹨Ðä´é¤ÓµÍºäÁèµÃ§¤ÃѺ ¼ÁÅͧÇÒ´á¹Ç¤Ô´¤ÃèÒÇæÁÒãËé´Ù 2 Ẻ (´Ñ§ÃÙ»·ÕèṺ) --------------------------------------------------------------------------------------
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