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#1
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ªèÇ´ÙÇÔ¸Õ·ÓãËé˹èͤÃѺ ÊÁ¡ÒÃ
$4x^\frac{1}{3} - 12x^\frac{-2}{3} = 0 $
$4x^\frac{-2}{3} (x - 3) = 0$ $ x = 3$ à¨Íã¹àÃ×èͧ¨Ó¹Ç¹¨ÃÔ§ÍÐ ´ÙáÅéǪèǺ͡˹èͤÃѺÇèÒ¤Ô´Âѧä§ãËéä´é¤ÓµÍºáºº¹Ñé¹ à»ç¹ä»ä´é¢Í͸ԺÒ´éǵÑÇ˹ѧÊ×Í´éǹêÒ>< ´ÙáµèµÑÇàÅ¢§§ ÅÐàÍÕ´ÂÔè§´Õ áËÐæ ú¡Ç¹Ë¹èͤѺº (¾×é¹°Ò¹äÁè¤èÍ´դѺ ÍèÒ¹àͧ[§§àͧ] à´ç¡ªèÒ§><) |
#2
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ÍéÒ§ÍÔ§:
4x^{\frac{1}{3}} - 12x^{\frac{{ - 2}}{3}} = 0 \] \[ 4x^{\frac{1}{3}} - \frac{{12}}{{x^{\frac{2}{3}} }} = 0 \] \[ x^{\frac{2}{3}} \left( {4x^{\frac{1}{3}} - \frac{{12}}{{x^{\frac{2}{3}} }}} \right) = x^{\frac{2}{3}} \left( 0 \right) \] \[ 4x - 12 = 0 \] \[ x = 3 \] »Å. ¼ÁÇèÒ¹èÒ¨Ðà¢éÒã¨áÅéǹФÃѺ ? |
#3
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¢Íº¤Ø³ÁÒ¡¤ÃѺ ¨ÃÔ§æÍÂÒ¡ÃÙéÇÔ¸Õ¢éÒ§º¹ÁÒ¡¡ÇèÒ áµèẺ¹Õé¡çâÍà¤áÅéǤÃѺ^^
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#4
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¡ç Íѹà´ÕÂǡѹ¹Õè¤ÃѺ
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à˹×Í¿éÒÂѧÁÕ¿éÒáµèà˹×Í¢éÒµéͧäÁèÁÕã¤Ã »Õ¡¢Õé¼×駢ͧ»ÅÍÁ§Ñé¹ÊԹР...âÅ¡¹ÕéâË´ÃéÒ¨ÃÔ§æ ÁѹãËé¤ÇÒÁÊØ¢¡ÑºàÃÒ áÅéÇÊØ´·éÒ Áѹ¡çàÍҤ׹ä»... |
#5
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ÍéÒ§ÍÔ§:
$4x^\frac{1}{3} - 12x^\frac{-2}{3} = 0 $ $4x^\frac{-2}{3}*x - 3*4x^\frac{-2}{3} = 0 $ (à¾ÃÒÐÇèÒ $x^\frac{1}{3} = x^\frac{-2}{3}*x $ ÁÒ¨Ò¡ $a^m*a^n =a^{m+n}$) $4x^\frac{-2}{3} (x - 3) = 0$ ´Ö§µÑÇÃèÇÁ·ÕèàËÁ×͹¡Ñ¹ÍÍ¡Áҹ͡ǧàÅçº [$ab-ac = a(b-c)$] áÊ´§ÇèÒ $4x^\frac{-2}{3}= 0$ ¹Ñ蹤×Í $x$ ËÒ¤èÒäÁèä´é ËÃ×Í $(x - 3) = 0$ ¹Ñ蹤×Í $ x = 3$ ¹Ó¤èÒ·Õèá¡éä´é ä»á·¹¤èÒã¹ÊÁ¡ÒÃà´ÔÁ ¼Å»ÃÒ¡®ÇèÒ 3 ãªéä´é ÊÃØ» ¤èҢͧ $x = 3 $ |
#6
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¢Íº¤Ø³ÁÒ¡æ¤ÃѺ^^
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