解题方法
1 . 已知
的角A、B、C所对的边分别是a、b、c,设向量
,
,
.
(1)若
,试判断
的形状并证明;
(2)若
,边长
,角
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a294138169a338323a41707cbc858530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2c4979a474ffbd9d36eb6fab0c719aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4715b11e05e58c6c7bd32ff79f056ad.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a53cdfd02f840f55c72dbb4d0607c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c6fbad2c0f50c0bee711922d138004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff56c753e26ceda3ad3a79eb778d6dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0334bc85843337c4dfcfdc5c638f9f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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2024-04-15更新
|
573次组卷
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3卷引用:贵州省黔西南州金成实验学校2023-2024学年高一下学期4月月考数学试题
贵州省黔西南州金成实验学校2023-2024学年高一下学期4月月考数学试题上海市上海大学附属中学2023-2024学年高一下学期期中考试数学试卷(已下线)模块三 专题2 解答题分类练 专题4 解三角形(解答题)
2 . 在
中,角
的对边分别是
,且
.
(1)证明:
.
(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/3d82705b3f982b0de94cc9954cefc07a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baa8d75a6638e08eedbff8662267da6f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3320a13248a3a1208ff6ee85c9d26f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
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7日内更新
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2卷引用:贵州省遵义市2023-2024学年高一下学期6月月考数学试题
名校
解题方法
3 . 已知
的内角A、B、C所对的边长分别为a、b、c,且满足
.请回答下列问题:
(1)证明:
为等腰三角形;
(2)若
的外接圆直径为1,试求
周长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720137bea4ca2abe1f49c45d63fa6a33.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
4 . 如图,在四棱锥
中,四边形
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f3a6b22b-d1a0-40f1-9c9c-6ffb655cd8cd.png?resizew=170)
(1)证明:平面
平面
.
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/917059c4d68de6935b5b010edd3b2efb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f3a6b22b-d1a0-40f1-9c9c-6ffb655cd8cd.png?resizew=170)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b31c44f920e6e09b02f03ec82ef843.png)
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2024-03-03更新
|
456次组卷
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2卷引用:贵州省黔东南苗族侗族自治州2023-2024学年高三上学期九校联考(开学考)数学试题
解题方法
5 . 设△ABC的内角A,B,C所对的边分别为a,b,c,
,且
.
(1)求证:
;
(2)求△ABC面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79998787e2d78b13494915896c446d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b409809543bae9f5e231a83e515dbbf.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66cbc9e5601178878c36c4f744bffa1.png)
(2)求△ABC面积的最大值.
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解题方法
6 . 如图,直四棱柱
中,
分别为
的中点,
,
,
.
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c6d9ef8efe6b947b6f5aa1ee95cd5f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e0b7d845cbceccd3e76ca461fcc534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50943279ee6f0299b3725eecd77bafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dbf31dfd36aa456a63bafea8bc1985.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/5106f5ed-ccaa-4275-9972-2e879f310ada.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1651bb032aa531a7aca3bc61e6a045d5.png)
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7 . 已知函数
.
(1)求
的值并求
的最小正周期和单调递增区间;
(2)求证:当
时,恒有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/815006f197941ceb1d8056d865753c32.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e38fffbc7ab9882480f4faa72390e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b0fd50ac74f1578fff87c2e18ffe80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17796db948012ea00f79954c0e389b0d.png)
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2022-11-04更新
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588次组卷
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4卷引用:贵州省贵阳市乌当区2023届高三上学期期中质量监测数学(文)试题
名校
8 . 已知
.
(1)求
的取值范围;
(2)若
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4c713535cdad706e60b91f752d99e2f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97e188ac2faddbfc1af5ccc789c7cae3.png)
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2023-02-19更新
|
468次组卷
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5卷引用:贵阳省铜仁市2023届高三下学期适应性考试(一)数学(理)试题
名校
解题方法
9 . 已知a,b,c分别为△ABC三个内角A,B,C的对边,
,且
.
(1)求A;
(2)若
,求证:△ABC是直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378d6132d464cd709363b092b1931d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d37ee47dec729c00720d177e2171ed83.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8877b8028b64772712db6af58cfa1ccd.png)
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2023-05-06更新
|
843次组卷
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5卷引用:贵州省贵阳市2023届高三适应性考试(二)数学(理)试题
10 . 四棱锥
中,底面
为矩形,
,
,
,
.
(1)平面
与平面
的交线为
,证明:
;
(2)
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bec03e804f0cea1db5cde2aa185056a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/24/d31b915c-3378-4eb1-a77a-f482d1195fb4.png?resizew=180)
(1)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/672e57c6ab0c23d782a1ae1116106834.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0a0c299356c26338d4153748e8a61d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5651e38293e0c42a7278af69fa53ae.png)
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