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III:平面坐標與向量

    標題 作者 回覆/查看 最後發表
  圓的外切四邊形必為菱形? ksjeng 2008-11-17 2 / 7710 2008-11-19 21:34 by ksjeng
  用托勒密求解圓內接四邊形 ksjeng 2008-11-16 3 / 6788 2008-11-18 00:37 by ksjeng
  為何依此法劃正五邊形,總會有誤差?! ksjeng 2008-11-17 2 / 11153 2008-11-17 23:47 by ksjeng
  向量法求三角形面積 ksjeng 2008-11-16 2 / 10378 2008-11-16 23:34 by ksjeng
  如何使用倍角公式與正弦定理求三角形形狀 ksjeng 2008-11-16 2 / 7976 2008-11-16 21:14 by ksjeng
  請教三角形求比例 ksjeng 2008-10-12 1 / 8644 2008-10-13 09:04 by weiye
  為何孟氏定理會有三種 ksjeng 2008-10-12 1 / 8467 2008-10-13 08:33 by weiye
  例題:平面向量,求極小值 weiye 2008-10-10 0 / 6204 2008-10-10 23:45 by weiye
  圓之極軸 chu1976 2008-10-2 1 / 7094 2008-10-5 17:15 by weiye
  向量題目,利用向量,證明不等式的題目. weiye 2008-9-15 0 / 8585 2008-9-15 17:14 by weiye
  向量內積 chu1976 2008-7-23 1 / 7099 2008-7-28 11:13 by futureyesi
  三角函數,和差化積題,求 sin(pi/14) - sin(3*pi/14) + sin(5*pi/14) weiye 2008-6-23 0 / 7412 2008-6-23 22:47 by weiye
  半角公式 E-How 2008-6-14 1 / 7622 2008-6-16 18:38 by weiye
  三角函數,倍角公式,證明 tanx+tan(x/2)=cscx-2cot(2x) weiye 2008-6-12 0 / 9469 2008-6-12 23:50 by weiye
  求兩燈塔距離 chu1976 2008-6-9 1 / 6907 2008-6-9 22:17 by weiye
  求所有可能的角度 chu1976 2008-6-3 1 / 7553 2008-6-4 08:42 by weiye
  向量-怎樣證明平行四邊形對角線平分 popopoi12345 2008-5-29 4 / 10779 2008-5-31 16:12 by popopoi12345
  正切值最小值 chu1976 2008-5-27 1 / 8013 2008-5-27 22:51 by weiye
  向量證明題 popopoi12345 2008-5-25 1 / 7918 2008-5-25 14:05 by weiye
  有理點 chu1976 2008-5-21 2 / 7031 2008-5-22 13:48 by chu1976
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