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#4
07 ¡Ã¡®Ò¤Á 2017, 12:17
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·ÓẺ¹ÕéäÁèä´é¤ÃѺ ¤èҵç¢Íº·Õè·ÓãËéà¡Ô´¤èÒÊÙ§ÊØ´ËÃ×͵èÓÊØ´ ÁѹäÁè¨Óà»ç¹µéͧà¡Ô´¤èÒ $x$ µÑÇà´ÕÂǡѹ
ËÅÑ¡¡Òä×Í ãËé $k = \sqrt{4-x^2}$ ¨Ðä´é $0 \le k \le 2$ ¨Ò¡¹Ñé¹à»ÅÕè¹⨷Âìà»ç¹ $k$ ãËéËÁ´¤ÃѺ ijso?? ¼Ô´áººà´ÕÂǡѺ㹤ӶÒÁ¹ÕéàŤÃѺ http://www.mathcenter.net/forum/showthread.php?t=23777
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07 ¡Ã¡®Ò¤Á 2017 12:22 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 2 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ gon 
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