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#1
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ªèÇ·դÃѺàŢ¡¡ÓÅѧ
1.¨§ËÒ૵¤ÓµÍº¢Í§ÊÁ¡Òà $3x- \sqrt{2x^2+6x+1} = 1-x^2$
2.¨§ËÒ૵¤ÓµÍº¢Í§ÊÁ¡Òà $2x^3 + 4x^2 + 2x - \sqrt{x^3 +2x^2 +x+3} = -5$ 3.¨§ËÒ૵¤ÓµÍº¢Í§ÊÁ¡Òà $2^x = 4^{x-1} * 8^{1-2x}$ 4.¨§ËÒ૵¤ÓµÍº¢Í§ÊÁ¡Òà $3^{4x+2} - 82(3^{2x}) = -9$ ¢Íº¤Ø³¤ÃѺ »Å.ÍÂÒ¡¨ÐÊ᡹ãËéáµèà¤Ã×èͧ»ÃÔé¹àÊÕ ãªé¤ÓÊÑè§äÁèà»ç¹ÍÕ¡ -*- 22 ¡Ã¡®Ò¤Á 2011 18:53 : ¢éͤÇÒÁ¹Õé¶Ù¡á¡éä¢áÅéÇ 6 ¤ÃÑé§, ¤ÃÑé§ÅèÒÊØ´â´Â¤Ø³ gon à˵ؼÅ: ´Ù http://www.mathcenter.net/forum/showthread.php?t=3627 |
#2
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Åͧà»ÅÕè¹µÑÇá»ÃÂѧ¤ÃѺ
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#3
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ÍÂèÒ§·Õè¤Ø³ Amankris ºÍ¡¤ÃѺ á·¹µÑÇá»ÃàÍÒ¤ÃѺ
1) $ x^2+3x-1= \sqrt{2x^2+6x+1} $ $ x^2+3x-1 =\sqrt{2(x^2+3x)+1}$ $ ãËé x^2+3x = a $ $ a-1=\sqrt{2a+1} $ ¤ÃѺ ·Õ¹ÕéÅͧ·ÓµèʹٹФÃѺ
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#4
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ÍéÒ§ÍÔ§:
¢éÍ 1 µÒÁàþº¹æàŤÃѺ ¢éÍ 2.¨§ËÒ૵¤ÓµÍº¢Í§ÊÁ¡Òà $2(x^3 + 2x^2 + x) - \sqrt{(x^3 +2x^2 +x)+3} = -5$ àËç¹ÍÐääÅéÒÂæ¡Ñ¹ã¹Ç§àÅçºäËÁ¤ÃѺ ¢éÍ 3 Åͧ·ÓãËé°Ò¹à»ç¹ 2 ·Ñé§ËÁ´¤ÃѺ ¨Ðä´éẺ¹Õé $2^x=2^{2(x-1)}\cdot 2^{3(1-2x)}$ ¢éÍ 4 $3^2\cdot3^{4x} - 82(3^{2x}) = -9$ $3^2\cdot(3^{2x})^2 - 82(3^{2x}) = -9$ áÅéÇÅͧà»ÅÕè¹µÑÇá»Å´Ù¹Ð¤ÃѺ |
#5
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¢Íº¤Ø³ÁÒ¡¤ÃѺ ¾Íä´éá¹Ç·Ò§áÅéǧèÒÂàÅ ^=^b
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