在三棱柱
中,侧面
为矩形,
,
,
为
的中点,
与
交于点
,
侧面
.
![](https://img.xkw.com/dksih/QBM/2014/1/22/1571503292874752/1571503298576384/STEM/cebb8e69dd5f43f4b273719f35549a0b.png?resizew=212)
(1)证明:
;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ef8866ccf160ddc441bf69c5d3a3d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeebdf3d00c146a1b4d220909d7573c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://img.xkw.com/dksih/QBM/2014/1/22/1571503292874752/1571503298576384/STEM/cebb8e69dd5f43f4b273719f35549a0b.png?resizew=212)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7768503b1ad4775258b2f1a71c413086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f842145a92b63d04c0fe88001f01d31e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/861d61d2b7b16e12fd97f870fb3fa522.png)
12-13高三·河南郑州·阶段练习 查看更多[3]
更新时间:2016-12-02 16:54:33
|
相似题推荐
【推荐1】如图,四边形
为菱形,
为
与
的交点,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b5d64b66-75b2-4e6b-aef3-de36ce81a7b5.png?resizew=163)
(1)证明:平面
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa54f0da891b574f2f372d9043f1d30.png)
(2)
, 三棱锥
的体积为
,求
长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/b5d64b66-75b2-4e6b-aef3-de36ce81a7b5.png?resizew=163)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4a46fbde58e12b1edc038ae9e921722.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa54f0da891b574f2f372d9043f1d30.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abd1684113913349815f4aa8ba0632b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b565e518d475a50358fedff2f0bb8dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1174142f3bba761585b6bc2653009b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
【推荐2】如图,正方体
的棱长为
,
分别是
的中点,点
在棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
上,
(
).
![](https://img.xkw.com/dksih/QBM/2018/4/7/1918897855471616/1920623011430400/STEM/61547b2378274b9a8d5bf3da57c2ce39.png?resizew=164)
(Ⅰ)三棱锥
的体积分别为
,当
为何值时,
最大?最大值为多少?
(Ⅱ)若
平面
,证明:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da188037fa76ddbcc3218e6086855f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd04af50507b7a3303dbd10efc7bdd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d61f98f7418eda31a1d7c457e3841c8.png)
![](https://img.xkw.com/dksih/QBM/2018/4/7/1918897855471616/1920623011430400/STEM/61547b2378274b9a8d5bf3da57c2ce39.png?resizew=164)
(Ⅰ)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004e50548f063aa85c7b1c3362e4c911.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70e5fe4b4b828f623e2e309affb37ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a59a49b6c313b8b47f19e17f5fb3f05.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/554923047631d16320c2ba39abeee99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db846fadd48e26c80e7ffc589a81f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb256fdcfbd980cbd37af42947666216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43db846fadd48e26c80e7ffc589a81f5.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,四边形ABCD为菱形,四边形ACFE为平行四边形,设BD与AC相交于点G,AB=BD=AE=2,∠EAD=∠EAB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/0a61013e-1376-4746-ab64-79cb44dfc0ed.png?resizew=169)
(1)证明:平面ACFE⊥平面ABCD;
(2)若直线AE与BC的夹角为60°,求直线EF与平面BED所成角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/0a61013e-1376-4746-ab64-79cb44dfc0ed.png?resizew=169)
(1)证明:平面ACFE⊥平面ABCD;
(2)若直线AE与BC的夹角为60°,求直线EF与平面BED所成角的余弦值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,在三棱锥
中,
是边长为4的正三角形,
,
,O为线段
上的一点,点P在底面
上的射影为点M.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957146753433600/2958535283236864/STEM/f929f8c8a27e41518b414a112281c733.png?resizew=182)
(1)证明:
平面
.
(2)若三棱锥
的体积为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b593497504e969c0eee7323ea788b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957146753433600/2958535283236864/STEM/f929f8c8a27e41518b414a112281c733.png?resizew=182)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73639766fd0d151415ef791061493fc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68872e4d7d86ec7683a9d45ec1a47ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
解题方法
【推荐1】如图,在三棱锥
中,
平面ABD,E为AB的中点,
,
.证明:
平面CED;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3931333820859378ea6723ff3075189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c01138acca46627f2dc26aeb95b4da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5297879d1299eea7f20bbcbe3db75c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://img.xkw.com/dksih/QBM/2023/11/10/3365061816909824/3365910169149440/STEM/125e4a6c9342447a83c2e0e2e1574e46.png?resizew=193)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,正方形ADEF所在平面和等腰梯形
所在的平面互相垂直,已知
,
.
;
(2)在线段BE上是否存在一点P,使得平面
平面
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db558e8db4c957654c8e5cecd2d2dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b87b3be10408261827291574434d8e.png)
(2)在线段BE上是否存在一点P,使得平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc8047ecbb77a3c5f61ab430b2279f3.png)
您最近一年使用:0次