名校
解题方法
1 .
中,已知
,点
在边
上,
.
(1)证明:
;
(2)若
,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33d7005b5818c4cb34cea35ea2bee08.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/1e3b17b8fc84b128c9947531269a5401.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5c4b886a48affa3e6103f7e4c2bfd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
您最近一年使用:0次
名校
2 . 如图直线
与
的边
分别相交于点D,E.设
,
,
,
.
(1)若
,F为
的外心,求
的值,
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd37b64af6bbdbf18adf222b8a5865ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad21f3682a4949e36a2c18fac6a5807.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/24059aa2-c71f-4263-a3a6-02c2dabc3979.png?resizew=152)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825b4d8a30df3008671b9eae1af54a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101392085fd7522233441af6eda74aed.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5b98ffb5258ca17bc6705972c97113.png)
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名校
解题方法
3 . 在锐角△ABC中,角A,B,C对边分别为a,b,c,设向量
,
,且
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cb21ae875f36d52d0b6f82b0201d0e.png)
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b320fd93c543ccf36310502b7b3a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc0018cd131352c839e574a16b5eca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4d070c5939bb0ec4a9d40d7e3c7d3f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cb21ae875f36d52d0b6f82b0201d0e.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b6de5b4ffa89779869664e41beff55.png)
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2023-08-07更新
|
856次组卷
|
5卷引用:辽宁省沈阳市第二中学2022-2023学年高一下学期期中考试数学试题
辽宁省沈阳市第二中学2022-2023学年高一下学期期中考试数学试题江苏省常州市第一中学2023-2024学年高二上学期期初数学试题河南省焦作市博爱县第一中学2023-2024学年高三上学期期中数学试题(已下线)6.4.3余弦定理、正弦定理(第3课时)(已下线)重难点08 正、余弦定理解三角形的重要模型和综合应用【八大题型】
解题方法
4 . 如图I为某同学搭建的立体几何模型,相关性质如图描述,其侧面展开图如图II所示.图I中,圆锥
的半径为3,体积为12π. 在等腰
(可近似看作与扇形KUN重合)中,
.中间圆柱展开图可看作正方形.圆柱J-G中,半径为3,体积为45π.侧面非阴影部分的圆边共占20%.设圆O所在平面为
,圆G所在平面为
,各立方体平稳放置,回答以下问题:
.
(2)试求K到G的距离及阴影部分面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181928a80db33cfb7b903f50ebad01f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27f6dcfcbc956cab53d53f39d5c47d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c11a3684becedd099419cc3fc019373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce52a7419783b3542d19b755e2cb028d.png)
(2)试求K到G的距离及阴影部分面积.
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5 . 如图,已知
,作正方形ADEB,BFGC,CHIA.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c080f62063acfe028208d9b0b40cf4.png)
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6 . 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
|
1752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专题07B立体几何解答题
7 . 如图,已知AM是
中BC边上的中线.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b73d9d332018afea17a39cb7aee142.png)
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8 . 在
中,角
的对边分别为
.
(1)求证:
;
(2)若
是
上一点,
平分
,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/b0faf9f046fcde132e55d5c4929aa749.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4313d6184e087fa6753a02379a8f8a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb8f06f42483209bdd51fb70b56a940.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e563e032dfdef69b0f357060c27bd4.png)
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名校
解题方法
9 . 已知在
中,角
的对边分别为
,点
满足
,且
.
(1)求证:
;
(2)求
的值.
![](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/41b85c495d1e6085c74de9c0ddbc1e53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9941d6dacd8ccf0742471c9bda65eca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a3bf6da4d9823ceaf3ec8b03b44de7.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ca7e840268b42f41ce1975962382c2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567f26c4bd29b1fb0ddf1cb28ad12cdb.png)
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2023-05-30更新
|
480次组卷
|
3卷引用:吉林省“BEST合作体”2022-2023学年高一下学期期末联考数学试题
解题方法
10 . 如图所示,在
中,P在线段BC上,满足
,O是线段AP的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/b85c66a0-3ff7-4d24-8740-6bbb38cb3501.png?resizew=164)
(1)过点O的直线与边AB,AC分别交于点E,F,设
,
.
①求证
为定值;
②设
的面积为
,
的面积为
,求
的最小值.
(2)若
是边长为1的正三角形,且
,
…
…
是线段BC的n等分点,
,其中
,n、
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b8e3e5d6bcb51f5a2317501feb73ecd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/2/b85c66a0-3ff7-4d24-8740-6bbb38cb3501.png?resizew=164)
(1)过点O的直线与边AB,AC分别交于点E,F,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61cb96903ddcfe069075ef87760ff6a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e12eb1c1546ff4ae9878ffa87136c05.png)
①求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a58464a16629aa18aa99187cb0d398.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235f0a6fb218d28383e6f27f2df1f50f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf99487d7860d017c0747ff966edfd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb90a2118db1e9945d7b5997bf2482a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/174f963c931b97d109f7f4227a7d453f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d1a406338067cfdeafaf575b2fbcdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad52924df9291d5d191d18e09374ee1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dece4d48b8710a86f23d979b1dbaa541.png)
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