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 / 9568	2008-12-14 00:46 by chu1976
附件	chu1976 2008-12-10	0 / 14699	2008-12-10 23:16 by chu1976
箏形有外心嗎?	ksjeng 2008-11-17	3 / 11257	2008-11-19 22:45 by weiye
圓的外切四邊形必為菱形?	ksjeng 2008-11-17	2 / 11979	2008-11-19 21:34 by ksjeng
用托勒密求解圓內接四邊形	ksjeng 2008-11-16	3 / 11389	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 / 16663	2008-11-17 23:47 by ksjeng
向量法求三角形面積	ksjeng 2008-11-16	2 / 15979	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 / 11891	2008-11-16 21:14 by ksjeng
請教三角形求比例	ksjeng 2008-10-12	1 / 14913	2008-10-13 09:04 by weiye
為何孟氏定理會有三種	ksjeng 2008-10-12	1 / 14093	2008-10-13 08:33 by weiye
例題：平面向量，求極小值	weiye 2008-10-10	0 / 9764	2008-10-10 23:45 by weiye
圓之極軸	chu1976 2008-10-2	1 / 11346	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 / 13187	2008-9-15 17:14 by weiye
向量內積	chu1976 2008-7-23	1 / 10990	2008-7-28 11:13 by futureyesi
三角函數，和差化積題，求 sin(pi/14) - sin(3pi/14) + sin(5pi/14)	weiye 2008-6-23	0 / 11408	2008-6-23 22:47 by weiye
半角公式	E-How 2008-6-14	1 / 11528	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 / 12964	2008-6-12 23:50 by weiye
求兩燈塔距離	chu1976 2008-6-9	1 / 10812	2008-6-9 22:17 by weiye
求所有可能的角度	chu1976 2008-6-3	1 / 11660	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 / 16050	2008-5-31 16:12 by popopoi12345

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