如图,在三棱柱
中,
,四边形
为菱形,
.
;
(2)已知平面
平面
,
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9332278351ab92e03e984e9279dd06a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43732729894297552d9210f41a634769.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870cee007535b979d35bc7feab75616.png)
(2)已知平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b65798afbc7efaed6d65d0719c3c391.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34f6658a6fa46b1597f382a3455ad04.png)
更新时间:2024-06-18 12:50:51
|
相似题推荐
【推荐1】如图甲,在平面五边形ABCDE中,AB//DC,∠BCD=90°,AB=AD=5,AE=3,BC=4,CD=2,∠AED=90°,EH⊥AD,垂足为H,将△ADE沿AD折起(如图乙),使得平面ADE⊥平面ABCD.
(1)求证:EH⊥平面ABCD;
(2)求三棱锥C-ADE的体积;
(3)在线段BE上是否存在点M,使得MH∥平面CDE?若存在,求
的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/28/e5bd9183-1a64-4549-9910-c15c1bab999f.png?resizew=384)
(1)求证:EH⊥平面ABCD;
(2)求三棱锥C-ADE的体积;
(3)在线段BE上是否存在点M,使得MH∥平面CDE?若存在,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd8a98e03f6bb5601c91e72e9102e44.png)
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解答题-问答题
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适中
(0.65)
名校
【推荐2】如图,在三棱柱
中,侧棱垂直于底面,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098764830736384/2098937960964096/STEM/cbf80c29dc5c4c1f90bbdd9c2f72c823.png?resizew=127)
(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/9c06154cae3bf7a8ce5a1e97a7380875.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://img.xkw.com/dksih/QBM/2018/12/17/2098764830736384/2098937960964096/STEM/cbf80c29dc5c4c1f90bbdd9c2f72c823.png?resizew=127)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25c31b0f47cf94018c82ae71396e1af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52753d89bf58589e2e83b19bd3d140b8.png)
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解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱锥
中,
平面
,底面
是菱形.
(1)求证:
;
(2)若平面
与平面
的交线为
,求证:
.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c70a73fc2e59b8bdf802b0072243ab0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/83298554-72b0-4162-bd20-c9d903e491f8.png?resizew=159)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
【推荐2】如图,四棱锥
中,底面
是平行四边形,
平面
,垂足为
,
在
上,且
,
,
,四面体
的体积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/8d3bd0d5-30c9-4499-93f9-0a9debfb880b.png?resizew=177)
(1)求点
到平面
的距离;
(2)若点
是棱
上一点,且
,求
的值.
![](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/c5354678a1506d618705514de0f09535.png)
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd68fd26d0900ef5e6ad44167763bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cb3079f764006129ddb935dee305b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/737b2c93541b78109910aa2aabe685eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97268c7593b444cb10e27cbca34b8094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/8d3bd0d5-30c9-4499-93f9-0a9debfb880b.png?resizew=177)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a2bb1f07a1709685fca0955196f32d1.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e532d3ed55c048eadb9e00b1a56ac534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e0225c6d7f9c9125bcd7154285096d.png)
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