解题方法
1 . 如图,在四棱锥
中,
平面
,点E为
的中点,连
.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974359065600000/2975240119042048/STEM/ec727042-24ae-4dc3-8e69-d0beb0764bc8.png?resizew=231)
(1)求证:
平面
;
(2)求点D到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acbd1de78e6a70ab79ee6314ed0277c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974359065600000/2975240119042048/STEM/ec727042-24ae-4dc3-8e69-d0beb0764bc8.png?resizew=231)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求点D到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2 . 如图甲,在
中,∠B=90°,BC=1,AB=2,D、E分别是AB、AC边上的动点(除去端点),满足
,
.现将△
沿DE折起,使点A到达点A'的位置,连接A'B,A'C得到如图乙所示的四棱锥A'-DBCE.
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913562102841344/2926158898552832/STEM/99c0eb7928f64e4bb7b0e123d5b013b2.png?resizew=140)
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913562102841344/2926158898552832/STEM/b7795cca6bc2497c8cb5484af0117652.png?resizew=175)
(1)设l为平面A'DE与平面
的交线,求证:l//平面DBCE;
(2)若A'D⊥BD,则当
为何值时,四棱锥A'-DBCE的体积最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f8b2287194cbc11b6f2ca16e57c990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9803747992ce4d717160187a4388a41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913562102841344/2926158898552832/STEM/99c0eb7928f64e4bb7b0e123d5b013b2.png?resizew=140)
![](https://img.xkw.com/dksih/QBM/2022/2/10/2913562102841344/2926158898552832/STEM/b7795cca6bc2497c8cb5484af0117652.png?resizew=175)
(1)设l为平面A'DE与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9834675e3f6975696f2dc7edf5fe1f7.png)
(2)若A'D⊥BD,则当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
解题方法
3 . 已知三棱柱
中,
,
,
平面ABC,
,E为AB中点,D为
上一点.
![](https://img.xkw.com/dksih/QBM/2022/5/5/2973016634769408/2974206562328576/STEM/9f0243801c1f4d95bc733dfb5914cd87.png?resizew=167)
(1)求证:
;
(2)当D为
的中点时,求三棱锥
与四棱锥
的体积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26cb239a35eb1f0563b5863d986859bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2022/5/5/2973016634769408/2974206562328576/STEM/9f0243801c1f4d95bc733dfb5914cd87.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
(2)当D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b565e518d475a50358fedff2f0bb8dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710c8b5ed74dc2df96a0dcbc5754156c.png)
您最近一年使用:0次
解题方法
4 . 在如图所示的几何体中,四边形ABCD为正方形,
平面ABCD,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/44534efe-687a-4d8b-85b1-25d60ccd1609.png?resizew=152)
(1)求证:
平面PAD;
(2)求直线AB与平面PCE所成角的正弦值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18e2605cd905f703a8fda77540347ad9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82465b63174087aeba7788ed984583d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/44534efe-687a-4d8b-85b1-25d60ccd1609.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a20ea69475dcf57a5ff18c13eceaaa.png)
(2)求直线AB与平面PCE所成角的正弦值;
您最近一年使用:0次
解题方法
5 . 在四棱锥
中,底面
为直角梯形,
,
,
,
分别为线段
,
的中点,
底面
,
.
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892243942899712/2909378096832512/STEM/532d1e297e54449bb1e4722c8a66fd08.png?resizew=201)
(1)作出平面
与平面
的交线
,并证明
;
(2)求点
到平面
的距离.
![](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/d730ae4307db56b47849c3a19dedfb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00a334aeb749a8177e1b5438d7d3e93.png)
![](https://img.xkw.com/dksih/QBM/2022/1/11/2892243942899712/2909378096832512/STEM/532d1e297e54449bb1e4722c8a66fd08.png?resizew=201)
(1)作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d27cf419c00c98e0212c1d441fa6ec.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c4554df2d60bde7377c63aad1f0e7b.png)
您最近一年使用:0次
解题方法
6 . 如图,在三棱柱
中,
⊥底面ABC,AB⊥AC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/705ff517-b158-431d-a511-25afb70e5408.png?resizew=131)
(1)求证:AB⊥平面
;
(2)若线段
与
的中点分别为E、F,求证:
平面ABC;
(3)已知AB=3,AC=4,且异面直线
与
所成的角为45°,求三棱柱
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/705ff517-b158-431d-a511-25afb70e5408.png?resizew=131)
(1)求证:AB⊥平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a407b262c22419f73396170ecdc849.png)
(3)已知AB=3,AC=4,且异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
您最近一年使用:0次
2022-04-21更新
|
731次组卷
|
2卷引用:安徽省滁州市定远县育才学校2021-2022学年高二分层班下学期期末文科数学试题
名校
解题方法
7 . 如图,四棱锥
中,底面ABCD为矩形,平面
平面ABCD,
,
,E,F分别为AD,PB的中点.求证:
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847899779072/2920000285032448/STEM/8c22064922c74549955b4ec103b2c53f.png?resizew=242)
(1)
∥平面PCD;
(2)平面
平面PCD.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0453cfd7e92bf7746a88280b9e7b580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882847899779072/2920000285032448/STEM/8c22064922c74549955b4ec103b2c53f.png?resizew=242)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
您最近一年使用:0次
2022-02-19更新
|
774次组卷
|
6卷引用:安徽省太和中学2022-2023学年高二上学期数学竞赛试卷
名校
解题方法
8 . 如图,在正方体
中,
分别是棱
,
,
,
的中点.
为梯形;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562b022158a42acccb8785cb75e5632a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea74bcb2642f3bdeb0f6d67b5baca43a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd61a751e4a47463b69923c771d085c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9189b58292cafb667004088b9b17c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a85c632e08ce1b355808bc7a9ad9a051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573d3f133de9f6595657a128bbd2489a.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f20ac8cec1d644e24eb900915d8b724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573d3f133de9f6595657a128bbd2489a.png)
您最近一年使用:0次
2022-04-17更新
|
1127次组卷
|
2卷引用:安徽省合肥市第十中学2021-2022学年高一下学期期中数学试题
9 . 直角梯形
中,
,
,
,
,
,将梯形沿中位线
折起使
,并连接
、
得到多面体
,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957283756580864/2958142468210688/STEM/72d861223fc5448198a11c115caf115d.png?resizew=279)
(1)求证:
平面
;
(2)求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635c0e8cd497fd3d766fede583f2e320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a48e31deb78dadacc7e128ef3eb2a054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e3878dcf86deee763b9fbd2d4ed2a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957283756580864/2958142468210688/STEM/72d861223fc5448198a11c115caf115d.png?resizew=279)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1e0bd4b30dc777ac9da80f6baa3eb31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
您最近一年使用:0次
2022-04-14更新
|
630次组卷
|
3卷引用:安徽省黄山市2022届高三下学期第二次质量检测文科数学试题
安徽省黄山市2022届高三下学期第二次质量检测文科数学试题(已下线)回归教材重难点03 立体几何-【查漏补缺】2022年高考数学(文)三轮冲刺过关宁夏石嘴山市第三中学2022届高三第三次模拟考试数学(文)试题
解题方法
10 . 已知直三棱柱
中,侧面
为正方形.
,
,
分别为
和
上的点,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/1442c4fd-db7a-4b80-9284-ed332c1d39c8.png?resizew=214)
(1)证明:
;
(2)求三棱锥
的体积;
(3)
为棱
上的点,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05e792484fa2e5f648397681b584807.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f157aab917082b835f4213ed81a3bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1586681cc763024b659b07dc4ccd02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364a55c81b4946a88f71a39f9f34ab1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/1442c4fd-db7a-4b80-9284-ed332c1d39c8.png?resizew=214)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af620f6d204d310d8e3f267fdd6c3f8.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52753d89bf58589e2e83b19bd3d140b8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c252a0fe067d434a2b5aeac011b9914.png)
您最近一年使用:0次
2022-04-30更新
|
424次组卷
|
2卷引用:安徽省滁州市凤阳县第二中学2022届高三下学期三模文科数学试题