如图,在四棱锥
中,底面
是矩形,
平面
,点
分别在线段
上,其中E是
中点,
,连接
.
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650929556840448/2652243087949824/STEM/f14f414ee3374ee8a50f93da2c5391d8.png?resizew=299)
(1)当
时,证明
平面
;
(2)当
为何值时,
.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9ea567f329fd06508903a815f71561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cca777c664ecc22e40dff4ccae6b248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63990b747412ceb354c03b9a13234ede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://img.xkw.com/dksih/QBM/2021/2/4/2650929556840448/2652243087949824/STEM/f14f414ee3374ee8a50f93da2c5391d8.png?resizew=299)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500d68f2678989a5ce7431cfd51b019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb841d975d5c7ab05598040e99df6825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb22a16dcf4e9f6a811025af789e0e3c.png)
20-21高二上·江西赣州·期末 查看更多[2]
更新时间:2021-02-06 15:05:17
|
相似题推荐
解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐1】如图,四棱锥
中,底面
为边长为2的菱形且对角线
与
交于点O,
底面
,点E是
的中点.
![](https://img.xkw.com/dksih/QBM/2022/9/1/3057193993101312/3060523413766144/STEM/cf2f4a7f04334206a3e5b8af33f8d5f8.png?resizew=194)
(1)求证:
∥平面
;
(2)若三棱锥
的体积为
,求
的长.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e46367882078adaa49ff44569bceb5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2022/9/1/3057193993101312/3060523413766144/STEM/cf2f4a7f04334206a3e5b8af33f8d5f8.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1112ffa328ed486ffc5e4a605eb510e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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【推荐2】如图,在直四棱柱
中,
,
,
是
的中点,且
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de9afe69f91d9c62a336c87559eb207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/e6375363-2d90-4420-9ebe-583b9fe665fb.png?resizew=196)
(1)证明:
平面
;
(2)求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de9afe69f91d9c62a336c87559eb207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/30/e6375363-2d90-4420-9ebe-583b9fe665fb.png?resizew=196)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc8021865f71bc4d19845c718277843.png)
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解题方法
【推荐2】如图,在四棱锥PABCD中,E是棱PC上一点,底面ABCD是正方形,平面ABE与棱PD交于点F,平面PCD与平面PAB交于直线l.求证:l∥EF.
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【推荐1】如图,直三棱柱ABC-A1B1C1中,M为BC的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/c74b04d7-99c5-488c-b277-c1bc070dc8a9.png?resizew=155)
(1)证明:A1B∥平面AMC1;
(2)求异面直线
与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16cfb38323095090b0fe5eee70b24210.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffa995ac1b73394a4cecf085527f5e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/c74b04d7-99c5-488c-b277-c1bc070dc8a9.png?resizew=155)
(1)证明:A1B∥平面AMC1;
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ef601ca1f9c4c031adab4ffed297f0.png)
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【推荐2】如图,四棱锥
中,
平面
,
平面
,
,F,M,N分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/22/2984742987235328/2984796227846144/STEM/e23ba5e2-36e7-4b8e-b0dc-e2eca82bebcf.png?resizew=168)
(1)求证:
∥平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1e038b4e76b3a368731d3331522b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b93d05221efb08e59809b66796030a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84dd030d3a6921f0806543b892f5b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3934576dbcbf6a06f86d634c1109628e.png)
![](https://img.xkw.com/dksih/QBM/2022/5/22/2984742987235328/2984796227846144/STEM/e23ba5e2-36e7-4b8e-b0dc-e2eca82bebcf.png?resizew=168)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
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