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ÊÁѤÃÊÁÒªÔ¡ ¤ÙèÁ×Í¡ÒÃãªé ÃÒª×èÍÊÁÒªÔ¡ »¯Ô·Ô¹ ¤é¹ËÒ ¢éͤÇÒÁÇѹ¹Õé ·Óà¤Ã×èͧËÁÒÂÍèÒ¹·Ø¡ËéͧáÅéÇ

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  #31  
Old 14 µØÅÒ¤Á 2008, 20:31
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$a^2-b^2=(a-b)(a+b)$

$(a-b)^2=a^2+2ab-b^2$»ÃÐÁÒ³¹Õé
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  #32  
Old 15 µØÅÒ¤Á 2008, 13:42
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$a^2-b^2=(a-b)(a+b)$

$(a-b)^2=a^2+2ab-b^2$»ÃÐÁÒ³¹Õé
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$(a-b)^2=a^2-2ab+b^2$äÁèãªèàËÃͤѺ
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  #33  
Old 22 µØÅÒ¤Á 2008, 20:27
¤usÑ¡¤³Ôm's Avatar
¤usÑ¡¤³Ôm ¤usÑ¡¤³Ôm äÁèÍÂÙèã¹Ãкº
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ÍÂÒ¡ä´é·ÕèÁҢͧáµèÅÐÊÙµÃÍèФÃѺ ¾ÃéÍÁ¡ÒþÔÊÙ¨¹ì
$1+2+3+4+5.......n$
$1+n=2+(n-1)=3+(n-2)=4+(n-3)=5+(n-4)=6+(n-5).............$
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22 µØÅÒ¤Á 2008 20:29 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¤usÑ¡¤³Ôm
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  #34  
Old 22 µØÅÒ¤Á 2008, 20:45
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µèͨҡÍѹà´ÔÁ
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$(a+b)*(a-b)$

$(a+b)\times (a-b)=(-ab-b^2)+(a^2+ab)$
=$a^2-b^2$
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22 µØÅÒ¤Á 2008 20:46 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 1 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¤usÑ¡¤³Ôm
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  #35  
Old 23 µØÅÒ¤Á 2008, 13:13
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ÊٵûշÒâ¡ÃÑʤѺ
$a^2+b^2=c^2$
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23 µØÅÒ¤Á 2008 13:13 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ ¡Ãza_ba_yo
µÍº¾ÃéÍÁÍéÒ§ÍÔ§¢éͤÇÒÁ¹Õé
  #36  
Old 23 µØÅÒ¤Á 2008, 13:28
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ÊٵûշÒâ¡ÃÑʤѺ
$a^2+b^2=c^2$
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  #37  
Old 23 µØÅÒ¤Á 2008, 13:38
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  #38  
Old 17 ¾ÄȨԡÒ¹ 2008, 17:21
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