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#1
25 àÁÉÒ¹ 2010, 17:16
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á¢è§¤³ÔµÏ ¤Ô´ä´é §èÒ´ÒÂàËÅ×Í á¢è§·Ø¡àÁ×èÍ Ãé͹áç á¨é§»ÃШѡÉì ÃѺÃÒ§ÇÑÅ ËÅÒ¡ËÅÒ ÁÒ¡ÁÒ¹ѡ áµèá¢è§ÃÑ¡ ÂÒ¡á·é á¾éã¨à¸Í  
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#2
03 ¾ÄÉÀÒ¤Á 2010, 19:22
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à´ç¡Á.»ÅÒÂ880¤¹µéͧ¡ÒÃÈÖ¡ÉÒµèÍ725¤¹·Ó§Ò¹160¤¹ÈÖ¡ÉÒµèÍËÃ×Í·Ó§Ò¹813¤¹¨§ËÒ¼Ùé·Õèµéͧ¡ÒÃÈÖ¡ÉÒµèÍààÅзӧҹµèÍÁÕà·èҡѺ¢éÍã´
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¤¹àÃÒËÒ¡ÅéÁ¡çµéͧÅØ¡ ¼Ùéã´ÅéÁààÅéÇäÁèÅØ¡¼Ùé¹Ñé¹ÂÔ觡ÇèÒÊعѢ ÊعѢÁѹÅéÁààÅéÇÁѹÂѧÅØ¡ä´é ààÅéÇ·ÓäÁ¤¹¶Ö§¨ÐÅØ¡äÁèä´é
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#3
04 ¾ÄÉÀÒ¤Á 2010, 00:17
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"So far as the theories of mathematics are about reality, they are not certain; so far as they are certain, they are not about reality" Albert Einstein https://www.facebook.com/SingaporeMathRam
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#5
05 ¾ÄÉÀÒ¤Á 2010, 09:40
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36 ¤¹ ¤ÃéÒººººººººº
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#7
16 ¾ÄÉÀÒ¤Á 2010, 13:57
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36 ¤¹¤ÃѺ ¶éÒ 72 ¤¹ Áѹ¨Ð«éÓ 2 ¤ÃÑ駵ç¡ÅÒ§¢Í§á¼¹ÀÒ¾àǹ¹ì-ÍÍÂàÅÍÃì¹Ð¤ÃѺ (¤Ô´ÇèÒ¹Ð)
ã¤ÃÇèÒ§æ ªèÇÂà©Å¡ÒúéÒ¹ãËé¼Á˹è͹ФÃѺ¢ÍÃéͧµéͧ¡Òäӵͺ´èǹÁÒ¡¤ÃѺ µÒÁÅÔ§¤ìàŤÃѺhttp://www.mathcenter.net/forum/showthread.php?t=10816
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ÍÂÒ¡´ÙàÊÅ´à»ç´ 16 ¾ÄÉÀÒ¤Á 2010 14:43 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ nongtum à˵ؼÅ: double post
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#9
30 ¾ÄÉÀÒ¤Á 2010, 18:34
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¼Áä´é 36 ÍФÃѺ = ='
¡ç¶éÒ 72 Áѹ¨Ð«éӵç¡ÅÒ§ ÍÂèÒ§·Õèàû º¹¢Í§º¹ ºÍ¡ ·ÕèºÍ¡ àÃÕ¹µèÍ"ËÃ×Í"·Ó§Ò¹ áÊ´§ÇèÒ àÍÒá¤è૵"àÃÕ¹µèÍ" ¡Ñº ૵"·Ó§Ò¹" äÁèàÍҵç¡ÅÒ§ ¶éÒ¨Ðà»ç¹Êٵáç A - (A$\cap$B) + B - (A$\cap$B) «Ö觨Ðä´éà»ç¹ A + B - 2(A$\cap$B) µèͤ×Í 725 + 160 - 2(A$\cap$B) = 813 ¨Ðä´é A$\cap$B = 36 ¤ÃѺ »Å.¼Ô´¾ÅÒ´µÃ§ä˹ ºÍ¡·Õ ¡ÅÑÇà©Å¼ԴáÅéÇ Ë¹éÒᵡ T_T
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#10
31 ¾ÄÉÀÒ¤Á 2010, 21:50
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¢Íâ·É¤Ø³ BasicDash ´éǹФÃѺáµèÇèÒ¡ÃмÁÅͧÁÒà»Ô´´ÙãËÁèáÅéǤӵͺà»ç¹ 72 ¤ÃѺ (˹éÒᵡàÅÂàÃÒ¢Íâ·É¨ÃÔ§æ¤ÃѺ)¢ÍÅͧá¡éµÑǹФÃѺ ãËé n(A) ¤×Í ¨Ó¹Ç¹¢Í§¤¹·ÕèÈÖ¡ÉÒµèÍ áÅÐ n(B) ¤×Í ¨Ó¹Ç¹¢Í§¤¹·Õèµéͧ¡ÒÃàÃÕ¹µèÍ
´Ñ§¹Ñ鹨Ðä´éÇèÒ n(A)=725 n(B)=160 n(A$\cap $B)= x n(A$\cup $B) = 813 813 = 725-x+160-x+x x=72 ¤¹¤ÃѺ
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