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#1
21 ¡ØÁÀҾѹ¸ì 2012, 17:52
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͸ԺÒ¢é͹ÕéãËé˹èͤÃѺ. (ʾ°)
㹧ҹÃѺàËÁÒ·ÒÊÕºéÒ¹.A áÅÐB. ªèÇ¡ѹ·ÒÊÕºéÒ¹·Ñé§ËÅѧàÊÃç¨ã¹àÇÅÒ6Çѹ
¶éÒA ·ÒÊÕºéÒ¹¤¹à´ÕÂǨÐàÊÃç¨àÃçÇ¡ÇèÒB 5 Çѹ ¨§ËÒÇèÒB ·ÒÊÕàÊÃ稺éÒ¹ËÅѧ¹ÕéàÊÃç¨ã¹àÇÅÒ¡ÕèÇѹ.  
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#3
21 ¡ØÁÀҾѹ¸ì 2012, 21:17
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¤ÇÒÁÊÒÁö㹡Ò÷ӧҹ
x=¨Ó¹Ç¹Çѹ㹡Ò÷ӧҹ(ËÒÇèÒ B ·Ó§Ò¹¡ÕèÇѹ ¤×ÍËÒ x+5) $A=\frac{§Ò¹}{x} $ $B=\frac{§Ò¹}{x+5} $ $6(\frac{§Ò¹}{x} +\frac{§Ò¹}{x+5} )=§Ò¹$ $12x+30=x^2+5x$ , (x-10)(x+3)=0 x=10 Çѹ µéͧ¡ÒÃËÒ x+5 =15 Çѹ
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