名校
解题方法
1 . 将平面直角坐标系中的一列点
.记为
,设
,其中
为与y轴正方向相同的单位向量若对任意的正整数n,都有
,则称
为T点列.
(1)判断点列
是否为T点列,直接写出结果;
(2)求证
是T点列:
(3)若
为T点列,且
.任取其中连续三点
,证明
为钝角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71fa0a4178c2ab8acf3342d228ed8e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f4f7da7655b76971cdf3e11600a9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/869434cabde100f74953780653d3a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88364f251f3d8a14d9784588f45f7acf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e972e658495ad2b603e2b11f3d5e20ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f4f7da7655b76971cdf3e11600a9f3.png)
(1)判断点列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf87e7e5ae1e3d45c2ccd73dd8d29a2.png)
(2)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6ec98836c8c456b45ab94f9aa5a7fb.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f4f7da7655b76971cdf3e11600a9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ed0fe3ab3607bcc987be7ba9ae5bc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade2b9aa97d71e08923f71c8eba032a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d24dc108423b4ca4d3b94e9779089f73.png)
您最近一年使用:0次
名校
2 . 如图,在
中,点
在边
上,且
.记
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/7af8525b-629f-41ce-a3ab-e8a444056401.png?resizew=192)
(1)求证:
;
(2)若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/299d7fba9e66b71eef7895ab9d073354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74491945847aa130dae78e6a8cb6f914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ea718698b44ab67a5dac6206e54f0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/7af8525b-629f-41ce-a3ab-e8a444056401.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0485afba4758035a1a93a1b8d4752852.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c95fa7f61564978c8e26616bc14449e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/841c4de47727d62aa60a33530bb6d958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc4844d3dd1b55de4c9f6c173845bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
2021-12-15更新
|
910次组卷
|
2卷引用:山东省潍坊市2021-2022学年高三上学期12月优秀生抽测数学试题
解题方法
3 . 在
中,内角A,B,C所对的边分别为a,b,c,已知
,
,点D在射线AC上,满足
.
(1)求
;
(2)设
的角平分线与直线AC交于点E,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91fc3570fb0b6bb12bc8c81aa5dd083a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc3fcb516ee06d76e992060334f3298b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245a94d9b0759fdb9a3db389cc113c75.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a15aee214fa9f744e2922ce5f64074.png)
您最近一年使用:0次
4 . 已知
中,内角
、
、
的对边分别为
、
、
,
为
的角平分线.
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866936566300672/2869727451389952/STEM/bfb0b953b8fa40e8b5992311635f99da.png?resizew=185)
(1)求证:
;
(2)若
且
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://img.xkw.com/dksih/QBM/2021/12/6/2866936566300672/2869727451389952/STEM/bfb0b953b8fa40e8b5992311635f99da.png?resizew=185)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c718ea35aad62ad670986f7b2a36fb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18af922d7bcd7a1bfbd89398d86eda5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d54d09ef825305de83671448a3dea21.png)
您最近一年使用:0次
2021-12-10更新
|
1131次组卷
|
6卷引用:湖北省鄂北六校2021-2022学年高三上学期期中联考数学试题
湖北省鄂北六校2021-2022学年高三上学期期中联考数学试题(已下线)2020年高考江苏数学高考真题变式题16-20题(已下线)专题12 中线、高线、角平分线问题-【重难点突破】2021-2022学年高一数学常考题专练(人教A版2019必修第二册) (已下线)押全国卷(理科)第17题 解三角形与数列-备战2022年高考数学(理)临考题号押题(全国卷)(已下线)5.4 正、余弦定理(精练)(提升版)-2(已下线)专题05 解三角形在几何与实际中的应用(2)-期中期末考点大串讲
名校
解题方法
5 . 在锐角
中, 角
的对边分别为
,已知
.
(1)求证:
.
(2)若
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4b3db2bf74ecf82df9a2200e84e304.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44c181a2f6ae22d5d52b374768dc57.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
名校
解题方法
6 . (1)如图,在矩形ABCD中,
,E为AB的中点,F是BC边上靠近点B的三等分点,AF与DE于点G.求
的余弦值;
(2)利用本学期所学知识(向量或解三角形)证明:平行四边形的两条对角线长的平方之和等于四条边长的平方之和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ecaea23c77bf54da0efcf95c463f0bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d6902c8862bd2616be038549f77aff.png)
(2)利用本学期所学知识(向量或解三角形)证明:平行四边形的两条对角线长的平方之和等于四条边长的平方之和.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/8/91f6f1fe-5465-4e7f-b754-3b346a2cb81f.png?resizew=113)
您最近一年使用:0次
7 . 在等腰直角三角形
中,已知
,点D,E分别在边
,
上,
.
(1)若D为
的中点,三角形
的面积为4,求证:E为
的中点;
(2)若
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
(1)若D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d6ceed6e5a36193bcb5a557853dbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2021-11-17更新
|
598次组卷
|
2卷引用:江苏省苏州市2021-2022学年高三上学期期中数学试题
解题方法
8 . 在
中,角
的对边分别为
,满足
且
.
(1)求证:
;
(2)若
,求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f676f4d2c3cf5ab66b2a41f69f11a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5190c074686d855c0ddba05bb238fe99.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc20d351d51723c9b0a07a20ac14114.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
解题方法
9 . 如图,在
中,点D在边AB上,BD=2AD,∠ACD=45°,∠BCD=90°.
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806317512343552/2816439122690048/STEM/c418c48580ba45dc88b6ad1c17b160a7.png?resizew=228)
(1)求证:
;
(2)若
,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/9/12/2806317512343552/2816439122690048/STEM/c418c48580ba45dc88b6ad1c17b160a7.png?resizew=228)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc52358578b0beea452f1cea25dcd920.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
您最近一年使用:0次
2021-09-26更新
|
1144次组卷
|
2卷引用:北京市北京理工大学附属中学2021-2022学年高二上学期开学考试数学试题
名校
解题方法
10 . 在三棱锥
中,
,
,
,
,点
在
上.
![](https://img.xkw.com/dksih/QBM/2021/12/18/2875341980663808/2912805677703168/STEM/32cff64a-2ade-4185-bfd1-636dc6b2e233.png?resizew=291)
(1)若
(如图1),证明:
;
(2)若二面角
是直二面角(如图2),求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292d0b9ce587bd5df884a988c22ccba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b6b7f04ff5708e0410a8ed7808a2f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01dcc9341f0c7b85b283aa974862aa22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b0b28a90e1cc4fae6d829e3798945e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/12/18/2875341980663808/2912805677703168/STEM/32cff64a-2ade-4185-bfd1-636dc6b2e233.png?resizew=291)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/442282574dd5ac7810502bf4757e2e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae64dbbab367827c0f2c0ffcc7eda4a1.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fe435f4b926f50e192aa559e5012db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7b4f3963adfc61fcd77a213f08d68b.png)
您最近一年使用:0次