#16
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ÍéÒ§ÍÔ§:
à¾ÃÒÐ ä´é$\frac{\sqrt{241}+1 }{2} áÅÐ\frac{\sqrt{-241}+1 }{2} $ àÃ×èͧ¹ÕéÍèÐàÃÒÃÙéáÅéÇÇèÒ¼Ô´µÑé§áµè¤Ø³silºÍ¡áµèäÁèÁÕàÇÅÒ¤Ô´ãËÁè
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23 µØÅÒ¤Á 2008 13:40 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¤usÑ¡¤³Ôm |
#17
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ÍéÒ§ÍÔ§:
¾Í´Õ¼ÁäÁèä´éÍèÒ¹·Õ ËØËØ
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¤¹àÃÒËÒ¡ÅéÁ¡çµéͧÅØ¡ ¼Ùéã´ÅéÁààÅéÇäÁèÅØ¡¼Ùé¹Ñé¹ÂÔ觡ÇèÒÊعѢ ÊعѢÁѹÅéÁààÅéÇÁѹÂѧÅØ¡ä´é ààÅéÇ·ÓäÁ¤¹¶Ö§¨ÐÅØ¡äÁèä´é |
#18
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[quote=¤usÑ¡¤³Ôm;41875]$x^2+x-60=0$
$(x-5)(x+6)=0$ $x=5,-6$ (x-5)(x+6) = x^2 + x - 30 ¹Ð¤ÃѺ äÁèãªè x^2+x-60 àÎèÍæ ¹Ñ¡»ÃÒªìÂѧÃÙé¾ÃÑ駤ÃѺ |
#19
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¤¹àÃÒËÒ¡ÅéÁ¡çµéͧÅØ¡ ¼Ùéã´ÅéÁààÅéÇäÁèÅØ¡¼Ùé¹Ñé¹ÂÔ觡ÇèÒÊعѢ ÊعѢÁѹÅéÁààÅéÇÁѹÂѧÅØ¡ä´é ààÅéÇ·ÓäÁ¤¹¶Ö§¨ÐÅØ¡äÁèä´é |
#20
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¤Ø³¡ç¤ÇèÐá¡éàËÁ×͹¡Ñ¹ äÁèãªèÍÐäáçÇèÒáµè¤¹Í×è¹ áÁéáµèµ¹ÂѧäÁèá¡éàÅÂ!!
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#21
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ÍéÒ§ÍÔ§:
à·Õº¡Ñ¹3/5=x/75 x »ÃÐÁÒ³45Á. àÊÒÊÙ§»ÃÐÁÒ³45Á. ·Õèà»ç¹¤èÒ»ÃÐÁÒ³à¾ÃÒÐäÁèÁÕËÒ¤èÒá·é¨ÃÔ§äÁèà¨Í ¡àÇé¹à¤Ã×èͧ¤Ô´àÅ¢ÇÔ·ÂÒÈÒʵÃì |
#22
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äÁèãªè¹Ð¤ÃѺ $\sin 37^\circ=\cos 53^\circ\approx \frac{3}{5}$
»Å.¤§¾ÔÁ¾ì¼Ô´ 31 ÁÕ¹Ò¤Á 2009 19:43 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ Ne[S]zA |
#23
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ÍéÒ§ÍÔ§:
µÒÁËÅÑ¡$\sin(x) = \cos(90-x)$
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31 ÁÕ¹Ò¤Á 2009 21:25 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 3 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¤usÑ¡¤³Ôm à˵ؼÅ: á¡élatex |
#24
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ÍéÒ§ÍÔ§:
¤èÒfunction¤ÇÃàËÁ×͹¡Ñ¹´éÇ¡è͹!¤ÃѺ(¡Ñ¹¼Ô´) ¨Ò¡ $COS A =SIN 6A$ $cosA=sin90-A$(Co-function) ᷹ŧ¨Ðä´é$sin(90-A)=sin(6A)$ àÁ×èͤèÒ(sine)à·èҡѹÁØÁ¡çµéͧà·èҡѹ $90-A=6A$ $90=7A$ $A=12.85$ ÁØÁA=12.85ͧÈÒ¤ÃѺ áµè¶éÒ¡Ó˹´ÇèÒÁØÁ A+6A=90 ¡ç·ÓÇԸբͧ¤Ø³ä´é 04 àÁÉÒ¹ 2009 14:14 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ Love math |
#25
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·Ñé§ÊÁ¡ÒáÓÅѧÊͧ ·Ñé§ sin cos àÍÒÁÒ¾Ù´¡Ñ¹ã¹Ëéͧ»ÃжÁµé¹ ªÑ¡ºéҡѹä»ãËèáÅéǤÃѺ
webmaster ¹èҨРmove ä»ËéͧÁѸÂÁ (à´ÕëÂÇà´ç¡ÁÒàË繨СÅÑÇ)
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ÁÒËÒ¤ÇÒÁÃÙéäÇéµÔÇËÅÒ¹ áµèËÅÒ¹äÁèàÍÒàÅ¢áÅéÇ à¢éÒÁÒ·ÓàÅ¢àÍÒÁѹÍÂèÒ§à´ÕÂÇ ¤ÇÒÁÃÙéà»ç¹ÊÔè§à´ÕÂÇ·ÕèÂÔè§ãËé ÂÔè§ÁÕÁÒ¡ ÃÙéÍÐäÃäÁèÊÙé ÃÙé¨Ñ¡¾Í (¡àÇ鹤ÇÒÁÃÙé äÁèµéͧ¾Í¡çä´é ËÒäÇéÁÒ¡æáËÅдÕ) (áµè¡çÍÂèÒãËéÁÒ¡¨¹·èÇÁËÑÇ àÍÒµÑÇäÁèÃÍ´) |
#26
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¤¹ä·ÂÃèÇÁã¨ÍÂèÒãªéÀÒÉÒÇÔºÑµÔ ½Ö¡¾ÔÁ¾ìÊÑÅѡɳìÊÑ¡¹Ô´ ªÕÇÔµ(¤¹µÍºáÅФ¹¶ÒÁ)¨Ð§èÒ¢Öé¹àÂÍÐ (¨ÃÔ§æ¹Ð) Stay Hungry. Stay Foolish. |
#27
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#28
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ÁÒËÒ¤ÇÒÁÃÙéäÇéµÔÇËÅÒ¹ áµèËÅÒ¹äÁèàÍÒàÅ¢áÅéÇ à¢éÒÁÒ·ÓàÅ¢àÍÒÁѹÍÂèÒ§à´ÕÂÇ ¤ÇÒÁÃÙéà»ç¹ÊÔè§à´ÕÂÇ·ÕèÂÔè§ãËé ÂÔè§ÁÕÁÒ¡ ÃÙéÍÐäÃäÁèÊÙé ÃÙé¨Ñ¡¾Í (¡àÇ鹤ÇÒÁÃÙé äÁèµéͧ¾Í¡çä´é ËÒäÇéÁÒ¡æáËÅдÕ) (áµè¡çÍÂèÒãËéÁÒ¡¨¹·èÇÁËÑÇ àÍÒµÑÇäÁèÃÍ´) |
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