名校
解题方法
1 . 如图甲,在矩形
中,
,E为线段
的中点,
沿直线
折起,使得
,O点为AE的中点,连接DO、OC,如图乙.
(1)求证:
;
(2)线段
上是否存在一点
,使得平面
与平面
所成的角为
?若不存在,说明理由;若存在,求出
点的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100af11e6cb83b56437f2db7dadeb9f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c8110f066b294763b30456f7cd90d1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/1/220b37b8-7b4a-412c-be13-4ab3ee79f955.png?resizew=438)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f4946f86dce1600096f79d7716ea03.png)
(2)线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/977a483bd52c08968f4097d10609be20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15615de1a6df206dbd081251f676578e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
您最近一年使用:0次
2023-07-28更新
|
784次组卷
|
6卷引用:重庆市长寿中学校2022-2023学年高二上学期期中数学试题
2 . 如图,在梯形
中,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/6713db70-9a6f-4c3b-95c2-4f49f4090b02.png?resizew=133)
(1)求证:
;
(2)若
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5bdd2b8ed74f06bbc2419a972c02042.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/14/6713db70-9a6f-4c3b-95c2-4f49f4090b02.png?resizew=133)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510634e49198fc429d942d00fa5446ab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341e8dae00f6b2abc94199ccfd6cf180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae139b51956b9281d73d9ba82b875e46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2023-05-11更新
|
1229次组卷
|
5卷引用:重庆市铜梁中学校2022-2023学年高一下学期期中数学试题
重庆市铜梁中学校2022-2023学年高一下学期期中数学试题河北省石家庄第二中学2023届高三下学期5月月考数学试题浙江省舟山中学2022-2023学年高一下学期5月月考数学试题(已下线)重难点突破02 解三角形图形类问题(十大题型)-1(已下线)第11章 解三角形 章末题型归纳总结(1)-【帮课堂】(苏教版2019必修第二册)
名校
解题方法
3 . 在锐角三角形
中,其内角
所对的边分别为
,且满足
.
(1)求证:
;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.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/5a2264c134952d41fb9bcb90e6c72c83.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b27a9205353ce97a85d161a993a060a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2d595eac6c838f3ab8ce12c22111d0.png)
您最近一年使用:0次
2023-07-18更新
|
873次组卷
|
4卷引用:广东省茂名市高州中学2023-2024学年高一下学期期中考试数学试题(创新班1-3班)
广东省茂名市高州中学2023-2024学年高一下学期期中考试数学试题(创新班1-3班)广东省广州外国语学校等三校2022-2023学年高一下学期期末联考数学试题(已下线)专题突破卷12 解三角形中的最值范围问题-1(已下线)高一下学期期末复习解答题压轴题二十四大题型专练(1)-举一反三系列(人教A版2019必修第二册)
名校
解题方法
4 . 在
中,内角
的对边分别为
,且
.
(1)证明:
是钝角三角形;
(2)
平分
,且交
于点
,若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5980696c0eddbec15ff028b246548c4.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2023-09-26更新
|
806次组卷
|
4卷引用:甘肃省金昌市永昌县第一高级中学2023-2024学年高三上学期期中数学试题
名校
解题方法
5 . 在△ABC中,角A,B,C的对边分别为a,b,c,且
.
(1)求角C的大小;
(2)CD为△ACB的内角平分线,且CD与直线AB交于点D.
(i)求证:
;
(ii)若
,
,求CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0b6610c9a6f17d84a5608c920e9826.png)
(1)求角C的大小;
(2)CD为△ACB的内角平分线,且CD与直线AB交于点D.
(i)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c000794ed0e22197c6c93bc32ea1715f.png)
(ii)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437d76fa3f5a82c9d36d6f4fb91454c8.png)
您最近一年使用:0次
名校
解题方法
6 . 在
中,内角
,
,
的对边分别为
,
,
,
.
(1)求角A的大小;
(2)若
是
角平分线,求证:
.
![](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/4666b737a55e5d514a97ebd0f805bdd5.png)
(1)求角A的大小;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f5a4a6a20f271a6edc890208f2acc95.png)
您最近一年使用:0次
7 . 在①
;②
这两个条件中任选一个,补充在下面问题中.
在
,角A,B,C的对边分别为a,b,c,且 .
(1)判断
的形状并给出证明;
(2)若
,求
的取值范围.
注:如果选择多个条件分别解答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e02e6946143207c276f7430942c1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd7ec9f2a433a1fe1975b221025a4be5.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe05083b4f23c15bf5616abd4a43c57e.png)
注:如果选择多个条件分别解答,按第一个解答计分.
您最近一年使用:0次
8 .
的内角
的对边分别为
,已知
.
(1)证明:
;
(2)若
是锐角三角形,
,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/99418c88d99cd2a151de0ae4e84017b7.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
2023-06-18更新
|
1191次组卷
|
4卷引用:安徽省合肥市2022-2023学年高一下学期4月期中考试数学试题
安徽省合肥市2022-2023学年高一下学期4月期中考试数学试题(已下线)专题突破卷12 解三角形中的最值范围问题-2山东省济南市天桥区黄河双语实验学校2023-2024学年高一下学期3月月考数学试卷专题05解三角形(第二部分)
名校
9 . 如图,在
中,
,点
是
上一点,
与
交于点
,且
,记
.
,求实数
的值;
(2)若
,求证:
;
(3)在(2)的条件下,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ed003b25adcd1e39639feab0b18615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be52e6bd55e8718771caf848c2499ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7560c30669949cfa399c25cf3a3bdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8187ab01a959abdff6f9da304143f238.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e8775a682511e43fd09fa38e4e4d5d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8e30987565d2a04c2a90af01edaa35.png)
(3)在(2)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22f121152f7cf840fc666fac97ea85d.png)
您最近一年使用:0次
2023-06-15更新
|
399次组卷
|
3卷引用:河南省河南大学附属中学2022-2023学年高一下学期期中数学试题
名校
解题方法
10 . 锐角
中,内角
所对的边分别为
,
且
,
.
(1)求证:
;
(2)将
延长至
,使得
,记
的内切圆与边
相切于点
,
是否为定值?若是,求出该定值,若不是,请说明理由.
![](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/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad5e009486af263893ca8290be72f258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b0809cdaa1254ac7593b058bb24fd0.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b9446d7b31f0d6e044cf99deeb20aa.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30bbc6ad0e9daceb42eff30021da1df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1ec05e3cec27677ded7b4aecaa62d3.png)
您最近一年使用:0次