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III：平面坐標與向量

    標題 作者 回復/查看 最後發表
  箏形有外心嗎? ksjeng 2008-11-17 3 / 990 2008-11-19 10:45 PM by weiye
  圓的外切四邊形必為菱形? ksjeng 2008-11-17 2 / 1058 2008-11-19 09:34 PM by ksjeng
  用托勒密求解圓內接四邊形 ksjeng 2008-11-16 3 / 959 2008-11-18 12:37 AM by ksjeng
  為何依此法劃正五邊形,總會有誤差?! ksjeng 2008-11-17 2 / 1307 2008-11-17 11:47 PM by ksjeng
  向量法求三角形面積 ksjeng 2008-11-16 2 / 1500 2008-11-16 11:34 PM 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 / 1515 2008-11-16 09:14 PM by ksjeng
  請教三角形求比例 ksjeng 2008-10-12 1 / 1147 2008-10-13 09:04 AM by weiye
  為何孟氏定理會有三種 ksjeng 2008-10-12 1 / 1272 2008-10-13 08:33 AM by weiye
  例題：平面向量，求極小值 weiye 2008-10-10 0 / 963 2008-10-10 11:45 PM by weiye
  圓之極軸 chu1976 2008-10-2 1 / 1154 2008-10-5 05:15 PM by weiye
  向量題目，利用向量，證明不等式的題目. weiye 2008-9-15 0 / 1240 2008-9-15 05:14 PM by weiye
  向量內積 chu1976 2008-7-23 1 / 1705 2008-7-28 11:13 AM by futureyesi
  圓的題目，求一直線等分五圓的面積和. weiye 2008-7-1 0 / 1698 2008-7-1 07:16 PM by weiye
  求重疊面積 chu1976 2008-6-21 1 / 1453 2008-6-24 09:38 AM by weiye
  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 / 1619 2008-6-23 10:47 PM by weiye
  半角公式 E-How 2008-6-14 1 / 1471 2008-6-16 06:38 PM by weiye
  三角函數，倍角公式，證明 tanｘ＋tan(ｘ／2)=cscｘ－2cot(2ｘ) weiye 2008-6-12 0 / 2053 2008-6-12 11:50 PM by weiye
  求兩燈塔距離 chu1976 2008-6-9 1 / 1244 2008-6-9 10:17 PM by weiye
  求所有可能的角度 chu1976 2008-6-3 1 / 1356 2008-6-4 08:42 AM by weiye
  向量-怎樣證明平行四邊形對角線平分 popopoi12345 2008-5-29 4 / 2174 2008-5-31 04:12 PM by popopoi12345
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