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III：平面坐標與向量

    標題 作者 回覆/查看 最後發表
  數形結合之不等式 chu1976 2008-12-14 0 / 7501 2008-12-14 00:46 by chu1976
  附件 附件 chu1976 2008-12-10 0 / 10637 2008-12-10 23:16 by chu1976
  箏形有外心嗎? ksjeng 2008-11-17 3 / 8763 2008-11-19 22:45 by weiye
  圓的外切四邊形必為菱形? ksjeng 2008-11-17 2 / 9480 2008-11-19 21:34 by ksjeng
  用托勒密求解圓內接四邊形 ksjeng 2008-11-16 3 / 8660 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 / 13770 2008-11-17 23:47 by ksjeng
  向量法求三角形面積 ksjeng 2008-11-16 2 / 12873 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 / 9614 2008-11-16 21:14 by ksjeng
  請教三角形求比例 ksjeng 2008-10-12 1 / 11268 2008-10-13 09:04 by weiye
  為何孟氏定理會有三種 ksjeng 2008-10-12 1 / 10790 2008-10-13 08:33 by weiye
  例題：平面向量，求極小值 weiye 2008-10-10 0 / 7708 2008-10-10 23:45 by weiye
  圓之極軸 chu1976 2008-10-2 1 / 8876 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 / 10743 2008-9-15 17:14 by weiye
  向量內積 chu1976 2008-7-23 1 / 8676 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 / 9037 2008-6-23 22:47 by weiye
  半角公式 E-How 2008-6-14 1 / 9271 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 / 10978 2008-6-12 23:50 by weiye
  求兩燈塔距離 chu1976 2008-6-9 1 / 8628 2008-6-9 22:17 by weiye
  求所有可能的角度 chu1976 2008-6-3 1 / 9354 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 / 12778 2008-5-31 16:12 by popopoi12345
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