2024·全国·模拟预测
解题方法
1 . 在
中,内角
的对边分别为
.
(1)判断
的形状,并证明;
(2)求
的最小值.
![](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/cbcded5f7161182f3041722b84068128.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a97ddfcbc0a53429da0be17ba4d61dee.png)
您最近一年使用:0次
2023高一·全国·专题练习
2 . 如图(1),在
中,
,
,
、
、
分别为边
、
、
的中点,以
为折痕把
折起,使点
到达点
位置(如图(2)).当四棱锥
的体积最大时,分别求下列问题:
与平面
的交线为
,求证:
平面
;
(2)在棱
上是否存在点
,使得
与平面
所成角的正弦值为
?若存在,求
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af260e0d98c95d1e092dc4c6d348e3ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74187fc6a743fd8c2f6fe2c4921795e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad31e49ddbdf115b71ea05ae4d9e979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf40f01583cd34578fb24473b1b1544b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
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名校
解题方法
3 . 记
的内角
所对的边分别是
,且满足
.
(1)证明:
;
(2)若
的面积为
,求
;
![](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/36976a79b97531faec39b0e620537410.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc2341245480bed8a9b884330efcab8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1659c6c88c3596b4b3d25db3c95f6d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354f86b608c5fa3641aff877665a992f.png)
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2024-02-29更新
|
892次组卷
|
4卷引用:第9章:解三角形章末重点题型复习-【帮课堂】(人教B版2019必修第四册)
(已下线)第9章:解三角形章末重点题型复习-【帮课堂】(人教B版2019必修第四册)上海市位育中学2023-2024学年高一下学期3月月考数学试卷(已下线)专题1 含正切的解三角形问题(每日一题)浙江省新阵地教育联盟浙江十校2024届高三下学期第三次联考(开学考试)数学试题
4 . 如图,三棱锥
中,
,
分别是
,
的中点.
(1)求证:
平面
;
(2)若
,
,
,
,
,
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/b9d8f7d7-e621-4da5-addd-c766a3e73bd5.png?resizew=146)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad4c0ba3a6750537789844d0ec419d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45723dce96b74f027adcb1a4ecd19db8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
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2023-06-08更新
|
1699次组卷
|
4卷引用:第07讲 立体几何大题(11个必刷考点)-《考点·题型·密卷》
(已下线)第07讲 立体几何大题(11个必刷考点)-《考点·题型·密卷》(已下线)模块五 专题2 期末全真能力模拟2专题07B立体几何解答题福建省普通高中2022-2023学年高二1月学业水平合格性考试数学试题
名校
解题方法
5 . 已知
中,角A,B,C所对的边分别为a,b,c,且
.
(1)证明:
;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fa5d5cc749d8b8bad2ef0a5b4cd271e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65c875691cec70bedee102d280f2f31.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06880757d57f2b12384eaf8443f74b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
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2024-02-14更新
|
1407次组卷
|
10卷引用:专题1.12平面向量及其应用-重难点突破及混淆易错规避(人教A版2019必修第二册)
(已下线)专题1.12平面向量及其应用-重难点突破及混淆易错规避(人教A版2019必修第二册)(已下线)热点3-3 正弦定理与余弦定理(8题型+满分技巧+限时检测)陕西省咸阳市武功县普集高级中学2023-2024学年高一下学期第1次月考数学试题河南省漯河市高级中学2023-2024学年高一下学期3月月考数学试题青海省西宁市第五中学2023-2024学年高一下学期4月月考数学试题河南省焦作市2024届高三一模数学试题河南省安阳市2024届高三第一次模拟考试数学试卷天一大联考2024届高三毕业班阶段性测试(五) 数学试题陕西省安康市高新中学2024届高三下学期2月月考数学(文)试题陕西省安康市高新中学2023-2024学年高三下学期2月月考理科数学试题
名校
解题方法
6 . 在
中,边
所对角分别为
且满足
.
(1)求证:
;
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6221ec128fef6064cb4d6534901c242.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2aea936a443fe6c909572392828783.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721e29b775e696045f44a4b1e7f74ef2.png)
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7 . 如图,在三棱锥
中,侧面
底面
,且
的面积为6.
(1)求三棱锥
的体积;
(2)若
,且
为锐角,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e20c91aa2c9c3fa6e28c91c39509401.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/e4ad30f2-3e8a-4402-9de2-006ac3bd16f1.png?resizew=124)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4548f93753d1a71f126a4fad52df024a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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2023-05-25更新
|
2231次组卷
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7卷引用:高一下册数学期末考试综合础评估卷2-【超级课堂】
(已下线)高一下册数学期末考试综合础评估卷2-【超级课堂】(已下线)高一下册数学期末模拟卷(一)【超级课堂】云南省福贡县第一中学2022-2023学年高一(重点班)下学期第二次月考数学试题专题07B立体几何解答题(已下线)第04讲 直线、平面垂直的判定与性质(练习)福建省普通高中2021-2022学年高二6月学业水平合格性考试数学试题四川省广元市宝轮中学2023届高三仿真考试(二)数学(文)试题
名校
解题方法
8 . 在锐角
中,内角
所对的边分别为
,满足
,且
.
(1)求证:
;
(2)已知
是
的平分线,若
,求线段
长度的取值范围.
![](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/9ed5deb0e05a5f253ab198b4ccb54b8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c7849c21d8acdeda0f83b4f163457.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f44c181a2f6ae22d5d52b374768dc57.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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2023-05-25更新
|
2432次组卷
|
5卷引用:6.4.3 余弦定理、 正弦定理 第2课时 正弦定理(分层作业)-【上好课】
(已下线)6.4.3 余弦定理、 正弦定理 第2课时 正弦定理(分层作业)-【上好课】(已下线)重难点突破03 三角形中的范围与最值问题(十七大题型)-1(已下线)专题02 解三角形大题湖北省黄冈中学2023届高三下学期5月三模数学试题山东省泰安市新泰市新泰中学2023届高考仿真训练(考前保温考)数学试题
名校
解题方法
9 . 如图,在△ABC内任取一点P,直线AP、BP、CP分别与边BC、CA、AB相交于点D、E、F.
(1)试证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3303605b3c1ec532a18bd4cf4e46fe9b.png)
(2)若P为重心,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/1cef3afd-1dd1-449b-84ec-2ae46c04cb39.png?resizew=122)
(1)试证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3303605b3c1ec532a18bd4cf4e46fe9b.png)
(2)若P为重心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbebab4378f2fce49884c192c4457993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
10 . 在
中,内角
,
都是锐角.
(1)若
,
,求
周长的取值范围;
(2)若
,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)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b3a08865b7605f248db6669776c62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6de1d395e6c48c0676a1488a299479d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c256c79e8c4c18fc669412ede195d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb3739951e47c21f579ce61c210e0c3.png)
您最近一年使用:0次