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#31
10 àÁÉÒ¹ 2010, 20:22
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ÍéÒ§ÍÔ§:
«Öè§Áѹ¨Ðà»ç¹ ¨Ø´àÃÔèÁµé¹¢Í§ µÃÕ⡳ÁÔµÔ áÅÐ ¤Ô´ Ptolemy's Theorem (à¡ÕèÂǡѺǧ¡ÅÁ)´éǤÃѺ ¤¹ä·ÂÁÑ¡àÃÕ¡ª×èÍÇèÒ »·ÍàÅÁÕ ÍФÃѺ
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10 àÁÉÒ¹ 2010 20:27 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¤usÑ¡¤³Ôm 
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#32
10 àÁÉÒ¹ 2010, 20:31
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ãªèàŤÃѺ ààÅéÇãªéËÒ sin 1 ä´é»èÒǤÃѺ
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¤ÇÒÁàÊÕ觷Õè¹èÒ¡ÅÑÇ·ÕèÊØ´äÁèãªè¡ÒáéÒÇ仢éҧ˹éÒààµè¤×Í¡ÒÃËÂØ´ÍÂÙè¡Ñº·Õè   
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#34
11 àÁÉÒ¹ 2010, 15:45
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¤Ó¶ÒÁàà»Å¡æ¤ÃѺ
1.ãËé xààÅÐy à»ç¹¨Ó¹Ç¹àµçÁºÇ¡ààÅéÇ x=(13^2)-(12^2)ààÅÐy^2=(x^2)-((20+35-16-19)^2) ¨§ËÒ¤èҢͧ [(y-99)(y-97)(y-95).............(y-3)(y-1)]/[(y-99)(y-97)(y-95).............(y-3)(y-1)] 2.Çѹ˹Ö觢³Ð·Õè´.ª.¡ ä¡è à´Ô¹ä»ÃéÒ¹¢¹Á»Ñ§à¢ÒÊǹ·Ò§¡Ñºà´ç¡ 4¤¹ààµèÅФ¹¾Ò¹éͧÁÒÍÕ¡ 4¤¹ ¹éͧ¢Í§à´ç¡ààµèÅФ¹ÍØéÁààÁǤ¹ÅÐ 4µÑÇ ¶ÒÁÇèÒÁÕ¤¹ààÅÐààÁǨӹǹà·èÒä÷Õèä»ÃéÒ¹¢¹Á»Ñ§ ààµè§àͧ¤ÃѺ 
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¤ÇÒÁàÊÕ觷Õè¹èÒ¡ÅÑÇ·ÕèÊØ´äÁèãªè¡ÒáéÒÇ仢éҧ˹éÒààµè¤×Í¡ÒÃËÂØ´ÍÂÙè¡Ñº·Õè
11 àÁÉÒ¹ 2010 15:47 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¹Ñ¡Ê׺ÍѨ©ÃÔÂÐ
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#35
12 àÁÉÒ¹ 2010, 10:06
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1.ãËé xààÅÐy à»ç¹¨Ó¹Ç¹àµçÁºÇ¡ààÅéÇ x=(13^2)-(12^2)ààÅÐy^2=(x^2)-((20+35-16-19)^2)
¨§ËÒ¤èҢͧ [(y-99)(y-97)(y-95).............(y-3)(y-1)]/[(y-99)(y-97)(y-95).............(y-3)(y-1)] $x=(13^2)-(12^2) = 5^2 = 25$ ààÅÐ $y^2=(x^2)-((20+35-16-19)^2)=25^2-20^2=15^2$ ¨Ðä´é¤èÒ y = +15 ËÃ×Í (y-15) = 0, ´Ñ§¹Ñ鹤èҢͧ $\dfrac{(y-99)(y-97)(y-95).............(y-3)(y-1)}{(y-99)(y-97)(y-95).............(y-3)(y-1)}$ ¨Ö§äÁè¹ÔÂÒÁ¤ÃѺ
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#36
12 àÁÉÒ¹ 2010, 10:14
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ÍéÒ§ÍÔ§:
à¾ÃÒФÓÇèÒ "Êǹ·Ò§¡Ñº" äÁèä´é¡Ó˹´ÇèҨеéͧÍÍ¡ÁÒ¨Ò¡ÃéÒ¹¢¹Á»Ñ§àÊÁÍ令ÃѺ 
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#37
12 àÁÉÒ¹ 2010, 16:28
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¶Ù¡µéͧ¤ÃѺ ¤Ø³Puriwatt
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¤ÇÒÁàÊÕ觷Õè¹èÒ¡ÅÑÇ·ÕèÊØ´äÁèãªè¡ÒáéÒÇ仢éҧ˹éÒààµè¤×Í¡ÒÃËÂØ´ÍÂÙè¡Ñº·Õè
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#38
15 àÁÉÒ¹ 2010, 22:44
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·èÒ·Ò§¨Ðà§Õº¨Ñ§àÅ _kup
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#39
17 àÁÉÒ¹ 2010, 16:30
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Post ¡Ñ¹Ë¹èͤÃѺ
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¤ÇÒÁàÊÕ觷Õè¹èÒ¡ÅÑÇ·ÕèÊØ´äÁèãªè¡ÒáéÒÇ仢éҧ˹éÒààµè¤×Í¡ÒÃËÂØ´ÍÂÙè¡Ñº·Õè
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#40
19 àÁÉÒ¹ 2010, 14:05
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ÍéÒ§ÍÔ§:
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(- -'')
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#43
19 ¡Ã¡®Ò¤Á 2010, 19:53
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ÍéÒ§ÍÔ§:
$\displaystyle \csc 10^\circ - \sqrt{3}\sec 10^\circ = \frac{4}{\sin 20^\circ}(\frac12\cos 10^\circ-\frac{\sqrt3}{2}\sin 10^\circ)=4\frac{\sin 20^\circ}{\sin 20^\circ}=4$
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¤¹ä·ÂÃèÇÁã¨ÍÂèÒãªéÀÒÉÒÇÔºÑµÔ ½Ö¡¾ÔÁ¾ìÊÑÅѡɳìÊÑ¡¹Ô´ ªÕÇÔµ(¤¹µÍºáÅФ¹¶ÒÁ)¨Ð§èÒ¢Öé¹àÂÍÐ (¨ÃÔ§æ¹Ð) Stay Hungry. Stay Foolish. 19 ¡Ã¡®Ò¤Á 2010 19:56 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ nongtum
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