#1
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ÍÂÒ¡·ÃÒºàÃ×èͧàÅ¢ÅӴѺ·Õè äÁèãªè àÅ¢¤³ÔµËÃ×ÍàÅ¢Ò¤³Ôµ - ¹ÔÂÒÁ - ¾¨¹ì·ÑèÇä» - ⨷ÂìµÑÇÍÂèÒ§ - ¡ÒûÃÐÂØ¡µìãªé ªèÇÂËÒ¢éÍÁÙÅãËé´éǹФÃѺ ã¤Ã·Õèà¡è§¤³ÔµªèÇÂâ¾ÊµÍº´éǹФÃѺ ¨Ðà»ç¹¾ÃФسà»ç¹ÍÂèÒ§ÊÙ§ |
#2
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ÍéÒ§ÍÔ§:
http://encyclopedia.learn.in.th/content.php?encid=50
__________________
site:mathcenter.net ¤Ó¤é¹ |
#3
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