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  #1  
Old 24 ¸Ñ¹ÇÒ¤Á 2012, 19:20
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Old 24 ¸Ñ¹ÇÒ¤Á 2012, 20:13
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$g(x)=2x-1$

$f(x)=\frac{2x-1}{x+1}$

$f'(1)=\frac{3}{4}$
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Old 24 ¸Ñ¹ÇÒ¤Á 2012, 21:39
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ÍèͤèÐ ^^
¹éͧ¢ÍªèÇÂ͸ԺÒÂÅÐÍÕ´¡ÇèÒ¹Õéä´éäËÁ¤èÐ?
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Old 24 ¸Ñ¹ÇÒ¤Á 2012, 23:36
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¨Ò¡ $\int g(x)dx=x^2-x+c$

´Ô¿·Ñé§Êͧ¢éÒ§¨Ðä´é

$g(x)=2x-1$

áÅÐ $g(x)=(x+1)f(x)$

´Ñ§¹Ñé¹ $(x+1)f(x)=2x-1$

¨Ðä´éÇèÒ $f(x)=\frac{2x-1}{x+1}$

$f'(x)=\frac{3}{(x+1)^2}$ ãªéÊٵôԿ¼ÅËÒÃ

$f'(1)=\frac{3}{4}$

¤ÃѺ¼Á
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Old 25 ¸Ñ¹ÇÒ¤Á 2012, 19:34
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