1 . 记
的内角A,B,C的对边分别为a,b,c,已知
,
,
.
(1)当
时,求
;
(2)是否存在正整数t,使得角C为钝角?若存在,求t的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a6d96f51ce847954a4a82d9857c5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8d61eb3525b9f1eaf94c1b01711e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e02affa024383de8506080c3e6f7bfa.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1311f32edf13f8caee5edb03f24a7ba.png)
(2)是否存在正整数t,使得角C为钝角?若存在,求t的值,若不存在,说明理由.
您最近一年使用:0次
名校
2 . 阿基米德螺线广泛存在于自然界中,具有重要作用.如图,在平面直角坐标系
中,螺线与坐标轴依次交于点
,
,
,
,
,
,
,
,并按这样的规律继续下去.给出下列四个结论:
,
为整数;②对于任意正整数
,
为整数;③存在正整数
,三角形
的面积为2025;④存在正整数
,三角形
为锐角三角形.其中所有正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17584c9b8f4e48c3a8e0a7c8ac626d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920e36afc62923f2dda82631490fc547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ac934c7b049be27290784a9478c82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1511466ac46376133963f9276381a83b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118c102d0a174e5521ec58a2c357bb7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cefa8b3307f16206f2792bfe611e034d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e1334862f58291d998975c5f571c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098eaf2a270d549f7e292d199c8b2906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f2f63fd60956219cc9eac437aebb3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a9e6722727ce60728fe1115f645a2fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad64a12f4337c1ce6236b9b2aae324b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2f40d15b6e2e0d09d4f12d4f600e53.png)
您最近一年使用:0次
3 . 如图,在
中,
,
,
、
分别在边
、
上,
,
且
.则
值是__________ ;
的面积是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de08e9e977f8997b0a7d351bf338c1fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d33367290ac86e10c2200df76f294b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c79c4d655d22f6b3e9826adc6df810.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa6361e919ac07ee6ed642556e1d1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/82503d9f-7ef6-4b2b-bfda-509f9a1abd17.png?resizew=157)
您最近一年使用:0次
2023-01-28更新
|
793次组卷
|
3卷引用:北京市中国人民大学附属中学2023届高三统练(4)数学试题
解题方法
4 . 在
中,
.
(1)求
;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24fad29a8069a1b5978f5c2d04575b49.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289295fad0d1c11fc74470e8bb0c6be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
您最近一年使用:0次
解题方法
5 . 记
中角
所对的边分别为
,已知
,
.
(1)求
;
(2)若
的周长为
,求
的面积.
![](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/5a2264c134952d41fb9bcb90e6c72c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb78c5731285ce6d82b6372aad27ee2c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/772b885848ba2c0140a2df71ba961f80.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2ec15c97a67c351b4d5bcb4c561c91.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
6 . 在△ABC中,若
,则△ABC一定是__________ 三角形.(请填写锐角,直角,或钝角)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e88df5e6371e55fc29278e7ec93e1391.png)
您最近一年使用:0次
2023-05-05更新
|
729次组卷
|
4卷引用:北京师范大学附属中学2022-2023学年高一下学期期中考试数学试题
解题方法
7 . 在
中,
,
,
,Q为
内一点,
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1896c3de78b61a931dfc2cd80e5905.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7af37d290218ada939110ee65dc26b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8064319cc96fba68bee0266d370c1b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1896c3de78b61a931dfc2cd80e5905.png)
您最近一年使用:0次
8 . 已知在
中,
,
.
(1)求A的大小;
(2)在下列四个条件中选择一个作为已知,使
存在且唯一确定,并求出
边上的中线的长度.
①
周长为
;②
;③
面积为
;④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e40c5ad95c19cefb39f4cf03d87513d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3711c8ba16405959bcb0b70385da1d89.png)
(1)求A的大小;
(2)在下列四个条件中选择一个作为已知,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab46ea0cba2d06283fae3d864a2329e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca820a456491348e72587e4fe10bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9739970fc82217b2663e98320f66ff.png)
您最近一年使用:0次
名校
解题方法
9 . 已知
中,角
,
,
所对的边分别是
,
,
,若
,且
,那么
是( )
![](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/0f67ff685af279c96825af2a16e31aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf377477ed3c778e90718f380893bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.直角三角形 | B.等边三角形 | C.等腰三角形 | D.等腰直角三角形 |
您最近一年使用:0次
2023-04-25更新
|
2499次组卷
|
24卷引用:北京市第八中学2022-2023学年高一下学期期中练习数学试题
北京市第八中学2022-2023学年高一下学期期中练习数学试题北京市昌平区前锋学校2024届高三上学期10月月考数学试题北京高一专题07解三角形吉林省洮南市第一中学2020-2021学年高一下学期第一次月考数学(理)试题天津市武清区天和城实验中学2022-2023学年高一下学期第一次月考数学试题(已下线)11.3 余弦定理、正弦定理应用(1)-2022-2023学年高一数学《考点·题型·技巧》精讲与精练高分突破系列(苏教版2019必修第二册)(已下线)专题强化 正、余弦定理综合性问题讲与练(1)-2022-2023学年高一数学《考点·题型·技巧》精讲与精练高分突破系列(苏教版2019必修第二册)陕西省西安中学2022-2023学年高二下学期综合评价(二)数学试题第十一章 解三角形(A卷·基础提升练)-【单元测试】2022-2023学年高一数学分层训练AB卷(苏教版2019必修第二册)江苏省连云港市锦屏高级中学等四校2022-2023学年高一下学期期中联考数学试题河北省石家庄市二十二中2022-2023学年高一下学期第一次月考数学试题(已下线)四川省巴中市2023届高三“一诊”考试数学(理)试题变式题11-15天津市第一中学2022-2023学年高一下学期期中数学试题山东省东营市利津县高级中学2022-2023学年高一下学期5月月考数学试题(已下线)期末模拟试卷01-期中期末考点大串讲(已下线)第02讲 正弦定理和余弦定理12种常见考法归类(2)浙江省宁波市奉化区九校联考2022-2023学年高二下学期期末模拟数学试题江苏省淮安市涟水县第一中学2022-2023学年高一下学期5月第二次月考数学试题河南省洛阳市栾川县第一高级中学2022-2023学年高一下学期5月月考数学试题(已下线)6.4.3 课时3 余弦定理、正弦定理应用举例-同步题型分类归纳讲与练(人教A版2019必修第二册)山东省烟台市莱阳市第一中学2023-2024学年高一下学期3月月考数学试题山东省泰安市第二中学2023-2024学年高一下学期3月月考数学试卷(已下线)模块二 专题5 三角形的形状问题(人教B版)重庆市第七中学校2023-2024学年高一下学期期中考试数学试题
名校
10 . 如图,在
中,
,
,
.
为
内部(包含边界)的动点,且
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84a9e05b88608a589a71b6de5e81e48.png)
___________ ;
的取值范围___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecea7657bb88976926ee41790d49012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52884209c1cce0b20a26d1a5e6024a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84a9e05b88608a589a71b6de5e81e48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea2ee6084ccda017840830036dddc23.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/e8356e1e-cc1a-4520-a179-0b9a4b055085.png?resizew=156)
您最近一年使用:0次
2022-11-26更新
|
529次组卷
|
4卷引用:北京市密云区2023届高三上学期阶段练习数学试题
北京市密云区2023届高三上学期阶段练习数学试题江苏省无锡市锡东高级中学2022-2023学年高一下学期期中数学试题(已下线)模块五 专题1 期末全真基础模拟1(已下线)模型1 平面向量几何意义的应用模型(高中数学模型大归纳)