解题方法
1 . 已知单位圆O上的两点A,B及单位圆所在的平面上的一点P,满足
(m为常数).
![](https://img.xkw.com/dksih/QBM/2022/7/12/3021141126963200/3022670374068224/STEM/5d665f28e40e4b738bb0d440e810db5a.png?resizew=343)
(1)如图,若四边形OABP为平行四边形,求m的值;
(2)若
,线段AB与OP交于点D,试求当△OPB为直角三角形时,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d56d0dc08181e9020088644e3b0ba12.png)
![](https://img.xkw.com/dksih/QBM/2022/7/12/3021141126963200/3022670374068224/STEM/5d665f28e40e4b738bb0d440e810db5a.png?resizew=343)
(1)如图,若四边形OABP为平行四边形,求m的值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0b498affcc0292ac2bc367b2d9391e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70d5d2eb30fb5554c6d09e75aa68913.png)
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2 . 如图,在△ABC中,已知
,
,
,BC,AC边上的两条中线AM,BN相交于点P.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/57a0eb47-c749-48cf-a4e0-7eb809af1d5c.png?resizew=225)
(1)求
的正弦值;
(2)求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea781ea1e67e42f1ab59768615a3172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/57a0eb47-c749-48cf-a4e0-7eb809af1d5c.png?resizew=225)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d73b2448f9aba5ca9885fd1edd1bca1.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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2022-02-27更新
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11卷引用:福建省2022-2023学年高二下学期质优生“筑梦”联考数学试题
福建省2022-2023学年高二下学期质优生“筑梦”联考数学试题广东省深圳市2022届高三下学期一模数学试题(已下线)技巧04 解答题解法与技巧(练)--第二篇 解题技巧篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》重庆市第八中学2022届高三下学期调研检测(四)数学试题(已下线)秘籍04 平面向量与复数-备战2022年高考数学抢分秘籍(新高考专用)湖南省常德市临澧县第一中学2022届高三下学期一模数学试题(已下线)5.4 正、余弦定理(精讲)-【一隅三反】2023年高考数学一轮复习(提升版)(新高考地区专用)(已下线)拓展二:三角形中线,角平分线问题(精讲)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)(已下线)专题6.7 平面向量的综合应用大题专项训练-举一反三系列(已下线)专题03 解三角形(分层练)(已下线)专题03 解三角形(解密讲义)
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3 . 已知椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
的短轴长等于
,离心率为
,
、
分别为椭圆
的上、下顶点.
(Ⅰ)求椭圆
的方程;
(Ⅱ)设
为直线
不同于点
的任意一点,若直线
、
分别与椭圆相交于异于
、
的点
、
,证明:
恒为钝角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb223b8777ab973970491bf0dcc6806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅰ)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72a5190834f5dbe895596656c038b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1156a8b29780810bd472f6d9e11b0e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
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