解题方法
1 . 如图,在四棱锥
中,底面
为菱形,
,
,
,
平面
,点M,N,H分别在棱PB,PD,PC上,且
.
;
(2)连接AC交BD于点O,连接OP.求证:
平面
;
(3)若H为PC的中点,PA与平面
所成角为60°,四棱锥
被平面
截为两部分,记四棱锥
体积为
,另一部分体积为
,求
.
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb96e0331eebe80ed1ff610faf531fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/debdc6632a4877e5131d3da25cda8b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828247a3338571cb0d4ba2a5bf88929c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec6297cf195e60fd53375a501deb2ac.png)
(2)连接AC交BD于点O,连接OP.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc6f007dbf1c1a36eb031e520608403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)若H为PC的中点,PA与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd68fe22ed9909165aedc98d1d8e3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bb075576cc0f585bda44277ac1d098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
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2 . 固定项链的两端,在重力的作用下项链所形成的曲线是悬链线,1691年,莱布尼茨等得出“悬链线”方程
,其中
为参数.当
时,就是双曲余弦函数
,类似的我们可以定义双曲正弦函数
.它们与正、余弦函数有许多类似的性质.
(1)求证:
;
(2)对
,不等式
恒成立,求实数
的取值范围;
(3)若
,试比较
与
的大小关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08144630f70f5bba0c73252569d97841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d848439a448faa1d4cd9fa20ca206215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe0a24e9c7616bf8afac5a0ffb0aa1fb.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bdd3fb4f930b309f261929ba7a1f055.png)
(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe9f3099ed9429dc5b4e38a350e524a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24464f0ea26038d85cc22a1786257605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a83c8948a168ff2c567aee048cabff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a2cebaab3423dfb2f2c944dfc43df8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb966b7b2dd6581640bcee2d97dacf77.png)
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3 . 在平面四边形
中(如图1),
,
,
,E是AB中点,现将△ADE沿DE翻折得到四棱锥
(如图2),
平面
;
(2)图2中,若F是
中点,试探究在平面
内是否存在无数多个点
,都有直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
平面
,若存在,请证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995f8d5c1e57b541c10f7c29645add31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43f7352b3a8c194b4c37485fb4ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4a6b8ef3e79b4482388c3391d8b18.png)
(2)图2中,若F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97a9b32570d553161be04d13954e92a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcfaca9396f85c0137b534903321fcbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa3254460ecbacecb3e57c5dce227f4.png)
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4 . 已知:如图,等腰三角形
中,
,
,直线
经过点
(点
、
都在直线
的同侧),
,
,垂足分别为
、
.
(1)求证:
;
(2)请判断
、
、
三条线段之间有怎样的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13b505788d3d02bf232ac637fc3a8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e72d26eae9a5470ac982541c609b109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/21/b7efb7d9-2f61-428f-9220-09f39fa06f0b.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e9e5200fe1aed46fc8dc8fcdd916d5.png)
(2)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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5 . 如图,在正方形ABCD中,
.求证:
.
证明:设CE与DF交于点O,
∵四边形ABCD是正方形,
∴
,
.
∴
.
∵
,∴
.
∴
.∴
.
∴
.∴
.
某数学兴趣小组在完成了以上解答后,决定对该问题进一步探究
(1)【问题探究】如图1,在正方形ABCD中,点E、F、G、H分别在线段AB、BC、CD、DA上,且
.试猜想
的值,并证明你的猜想.
(2)【知识迁移】如图2,在矩形ABCD中,
,
,点E、F、G、H分别在线段AB、BC、CD、DA上,且
.则
___________.
(3)【拓展应用】如图3,在四边形ABCD中,
,
,
,点E、F分别在线段AB、AD上,且
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b84ed8d927b77491092f7d2ee2989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf857e03d4320c999d328fd657c2d412.png)
证明:设CE与DF交于点O,
∵四边形ABCD是正方形,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0973b93383c24af95de98d9cacb2843b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0e50d96e967bd909e665070db3d9a4.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783b84ed8d927b77491092f7d2ee2989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8cc88685997c7586d1d4bf75a055433.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37f8d038a3d35e39ece97f530a324b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd478aa6add1eae126321890a34dde15.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af9ed02d3b811045d61cffd2b2edf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf857e03d4320c999d328fd657c2d412.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/0a9342c1-2813-4c25-97f8-9a0d42f5ddcf.png?resizew=104)
某数学兴趣小组在完成了以上解答后,决定对该问题进一步探究
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/7ea22d00-fa1d-497b-9cc6-4c1c55f886d3.png?resizew=418)
(1)【问题探究】如图1,在正方形ABCD中,点E、F、G、H分别在线段AB、BC、CD、DA上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885a273360456694a3d40a913f3df2fc.png)
(2)【知识迁移】如图2,在矩形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890aea25780f7ba34adb23e799808462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846b1b49f05812b0761eb565062d32f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d852b8a7e7b287c0bae2ce10d3e6dc1.png)
(3)【拓展应用】如图3,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b670ec1599330f6af99c600404afcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
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解题方法
6 . 《见微知著》谈到:从一个简单的经典问题出发,从特殊到一般,由简单到复杂,从部分到整体,由低维到高维,知识与方法上的类比是探索发展的重要途径,是发现新问题、新结论的重要方法.
例如,已知
,求证:
.
证明:原式
.
波利亚在《怎样解题》中也指出:“当你找到第一个蘑菇或作出第一个发现后,再四处看看,他们总是成群生长.”类似上述问题,我们有更多的式子满足以上特征.
请根据上述材料解答下列问题:
(1)已知
,求
的值;
(2)若
,解方程
;
(3)若正数
满足
,求
的最小值.
例如,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180409002586c7e3c2e06f6fdd742f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45fc0d73e11222c72a9afbfa9d091b3.png)
证明:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d4b25c598517637dc8234d567f344be.png)
波利亚在《怎样解题》中也指出:“当你找到第一个蘑菇或作出第一个发现后,再四处看看,他们总是成群生长.”类似上述问题,我们有更多的式子满足以上特征.
请根据上述材料解答下列问题:
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180409002586c7e3c2e06f6fdd742f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e62883c4d3d8de9ac5b8eed793d5bd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52431587ef305ddb410bece4a6d76ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d91c584d15767339f6e84b78dddaf9b.png)
(3)若正数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c48e4da908f869244dd5ba4dd3b4a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180409002586c7e3c2e06f6fdd742f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46efe66dfaaf30d5f5969a4d1d6b8414.png)
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2022-10-21更新
|
437次组卷
|
4卷引用:四川省攀枝花市第三高级中学校2023-2024学年高一上学期10月月考数学试题
四川省攀枝花市第三高级中学校2023-2024学年高一上学期10月月考数学试题广东省中山市2022-2023学年高一上学期第一次调研数学试题四川省成都市第七中学2023年高三上学期1月月考数学文科试题(已下线)第03讲 第二章 一元二次函数、方程和不等式章节综合测试-【练透核心考点】
解题方法
7 . 设数列
的前n项和为
,前n项积为
,且
.
(1)求证:数列
是等比数列;
(2)求数列
的通项公式及前n项和
;
(3)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fafaaa16f492df2dfe80b904ead6fb02.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf3da897eb73b729f66bb0d700775c5.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9ef731ed306ad403782ca0a1c9961a6.png)
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8 . 设数列
的前n项和为
,已知
,
(
).
(1)求证:数列
为等比数列;
(2)若数列
满足:
,
.
(i) 求数列
的通项公式;
(ii)若数列
的前n项和为
,证明:
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bac7288093b7d91a6c4f50003b990476.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88e5b562e58c3d2b67ccdfe0092d01c.png)
(i) 求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(ii)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdf072477557ad3dbc7acfa8088436d.png)
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2022-05-24更新
|
364次组卷
|
2卷引用:四川省南充市白塔中学2021-2022学年高一下学期第四次(5月)月考数学(文)试题
名校
解题方法
9 . 如图,四棱锥
中,
,
,E为PB的中点.
平面PAD;
(2)过D点是否存在一个与PA,AB相交,且与平面PBC平行的平面?若存在,指出交点位置,并证明你的结论;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4031f4aae0b996ce8fec956fb2879f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12143a06ed24558d8cc7ad39961d3e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f30e54bb771ad15067221459f202f01.png)
(2)过D点是否存在一个与PA,AB相交,且与平面PBC平行的平面?若存在,指出交点位置,并证明你的结论;若不存在,请说明理由.
您最近一年使用:0次
2022-05-04更新
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984次组卷
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5卷引用:四川省南充市嘉陵第一中学2023-2024学年高一下学期第三次月考数学试卷
10 . 如图,直线AB经过⊙O上的点C,并且OA=OB,CA=CB,⊙O交直线OB于E,D,连接EC,CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/b1d868e9-96c8-424a-a0fe-cff93a4fecf9.png?resizew=189)
(1)求证:直线AB是⊙O的切线;
(2)试猜想BC,BD,BE三者之间的等量关系,并加以证明;
(3)若
,⊙O的半径为3,求OA的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/15/b1d868e9-96c8-424a-a0fe-cff93a4fecf9.png?resizew=189)
(1)求证:直线AB是⊙O的切线;
(2)试猜想BC,BD,BE三者之间的等量关系,并加以证明;
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219a483b5834a9d8d6bd00fd0458ab01.png)
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