1:1  12-21[文·数学]丁老师教你三角函数与平面向量的综合问题 讲解人：http://www.jiandan100.cn/teacher/e3a3f4df5e7a4ec68ee9286a386f3442/ ，全国著名数学特级教师，北京市陈经纶中学数学组组长，首席数学教师。 推荐理由：此题考查了两个向量夹角的概念、平面向量的数量积运算、余弦定理等知识，考查了运算求解能力以及数形结合的思想、化归与转化思想，求解时应注意向量  的夹角应当是∠B的外角，切勿弄错。
题面：在△ABC中，AB=2，AC=3， = 1则BC=________________．
【答案及详解】
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向量夹角经常被弄错，一定要注意判断哟 ------------------------------------------------------------------------------------------------------------------------------------------------------------------ 查看更多本年级每周一题，请点击： http://www.jiandan100.cn/bbs/upload/forumdisplay.php?fid=386& 浏览本期“简单学习电子周报”完整目录：http://www.jiandan100.cn/bbs/upload/viewthread.php?tid=657798 |
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沙发#
发布于：2012-12-22 13:11
a
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板凳#
发布于：2012-12-22 20:16
原帖由 tankefeitongxue 于 2012-12-22 13:11 发表 ui-_-|||T^T(*^◎^*)O(∩_∩)O~ |
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地板#
发布于：2012-12-22 22:27
xxxxxxxx
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4楼#
发布于：2012-12-22 22:39
AAAAAAAAAAAAA
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5楼#
发布于：2012-12-23 15:20
aaaaaaaaaaaaaaaaaa
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6楼#
发布于：2012-12-23 16:16
AAAAAAAAAAAAA
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7楼#
发布于：2012-12-23 19:46
111111111111111111111111
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9楼#
发布于：2012-12-24 20:34
题目真有意思。需要仔细分析。顶
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