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#1
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[ÊÍǹ. ºÙÃ¾Ò 2556] Ãͺ¤Ñ´àÅ×Í¡
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(äÁèä´éàÃÕ§¢éÍ) 1.ËҼźǡ¢Í§¤èÒÊÑÁºÙóì¢Í§¤ÓµÍºÊÁ¡Òà $x^3-2x^2+9x-18=0$ 2.ËÒ¤èÒ $x$ ·Õè·ÓãËé $\frac{(x^2-2x+3)(x-1)^2}{2x(x+1)^2}\geqslant 0$ 3.ãËé $\theta=\frac{2\pi}{2}$ ËÒ¤èÒ $cos\frac{\theta}{2}+cos2\theta = ?$ 4.ËÒ૵¤ÓµÍº¢Í§ $x$ ·Õè·ÓãËé $log_2x+4log_2x=5$ à´ÕëÂÇÁÒà¾ÔèÁ¤èÐ
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-It's not too serious to calm - Fighto! |
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¢éÍ 4 µÍº 16 ´éÇÂä´éÁÑé¤Ð
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-It's not too serious to calm - Fighto! |
#3
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¢Íâ·É¤èÐ ¾ÔÁ¾ì⨷Âì¼Ô´
3. ãËé$\theta = \frac{2\pi }{5}$ ËÒ¤èÒ $cos\frac{\theta}{2}+cos2\theta=?$
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-It's not too serious to calm - Fighto! |
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¢éÍ·Õè $1.$
$x^3-2x^2+9x-18=0$ $x^2(x-2)+9(x-2)=0$ $(x^2+9)(x-2)=0$ à¾ÃÒЩ¹Ñé¹ÃÒ¡¢Í§ÊÁ¡Òà ¤×Í $ 2,3i,-3i$ $|2|+|3i|+|-3ri|=2+3+3=8$ ¢éÍ·Õè $4.$ $log_2x+4log_2x=5$ $5log_2x=5$ $log_2x=1$ $x=2$ |
#5
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¢éÍ 2.(0,infinity)
¢éÍ 3.0 |
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