如图,在正四棱锥
中,已知侧棱和底面边长相等,E是
的中点,F是
的中点.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
平面
;
(2)求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/aea0c2ee-7979-4307-a8c7-30a31f46f090.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/425bb0d1c21eb4448dbbe9a41efa7538.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
22-23高一下·广东韶关·期末 查看更多[2]
更新时间:2023-07-11 08:58:22
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,在四棱锥
中,底面
为矩形,侧棱
底面
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2022/10/11/3085333629345792/3086257386332160/STEM/98d28877905f4e7392abcb018a359c07.png?resizew=182)
(1)求直线
与
所成角的余弦值;
(2)在侧面
内找一点
,使
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4db3940f180ba6947c2edcfaf4431e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc77e828650bc522b229a9d11e0197c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9a872a0d18408b9b541f3e5ba462a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73e0b10b0e45ee1193ab26836bf1ff0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c207c5c06f3f074ea61fc14de21abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2022/10/11/3085333629345792/3086257386332160/STEM/98d28877905f4e7392abcb018a359c07.png?resizew=182)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)在侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9eeee83b4b7c6ceac7828ff534ce15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0502734c691956932c1f4005c4fc92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
【推荐2】设
,
,
,
分别是空间四边形
的边
,
,
,
的中点,
,
分别是这个空间四边形两条对边
,
的中点.
(1)求证:
;
(2)若
,
,求
的值;
(3)若
,
,
,求异面直线
与
所成的角的大小;
(4)求证:
,
,
相交于同一点.
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78381822dccdb174415957d5c99c877.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae8a560832989c416096a7897bbc419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05529d5906c6873231d138127bc9e2d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8790596930426b683ff8d2c132f962.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ae8a560832989c416096a7897bbc419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(4)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.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,已知
平面
,
平面
,
为等边三角形,
,F为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589026775572480/2592774252470272/STEM/5f8fedf6354c4f7fb9d1388ad0da8272.png?resizew=207)
(1)求证:
平面
;
(2)求证:
平面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb59a3752da728cfa77557dd14d0f737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/11/9/2589026775572480/2592774252470272/STEM/5f8fedf6354c4f7fb9d1388ad0da8272.png?resizew=207)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a903a74a2459990b00652a8b8453a503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在三棱锥
中,
,
,点
分别为
的中点.
(Ⅰ)求证:
;
(Ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033dcdb8b4d8a9411dbb0941686ce470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71053b2dba1f1d12805269920eb68d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702e61ac15503475f4a0965564d62f3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac76d58dc1449b42a73432772ca8364.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2439042564956ef094805e0d8a970eb.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d5cefd02d5882b86b82e0e0c50fc2d1.png)
![](https://img.xkw.com/dksih/QBM/2018/7/23/1994749551935488/1995909767675904/STEM/1a9be4a2c5394f9894b16ccdf9928d03.png?resizew=163)
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3】如图,已知四棱锥
的底面为菱形,对角线
与
相交于点
,平面
垂直于底面
,线段
的中点为
.
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606884358815744/2614927373115392/STEM/ba0a9ba7-4032-4ab7-9495-d3d094a492c5.png?resizew=178)
(1)求证:
平面
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/12/4/2606884358815744/2614927373115392/STEM/ba0a9ba7-4032-4ab7-9495-d3d094a492c5.png?resizew=178)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在直四棱柱
中,已知
,
.
(1)求证:
;
(2)设
,且
是
上一动点,当
平面
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8685f5b5ff947449a3123d041ad4f753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89b12f86daa259c4107686bd2cdde41.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27003d5a57fa7a89737aaaffc0afd57e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ab3f95669261cacb5f017730202261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6e18b1118152ed4cb68cf6c8c7fdece.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/5275f885-dd04-46d3-a5cd-464c46c4bfb3.png?resizew=117)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,四棱锥P-ABCD中,底面ABCD是正方形,PD⊥平面ABCD,
,E、F分别是PC、AD中点.
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017587502268416/3018367612116992/STEM/a7cc00d606ed439a85a676ecc54a5a95.png?resizew=175)
(1)求直线DE和PF夹角的余弦值;
(2)求点E到平面PBF的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99926bf272cd757f0985c69b390ebcce.png)
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017587502268416/3018367612116992/STEM/a7cc00d606ed439a85a676ecc54a5a95.png?resizew=175)
(1)求直线DE和PF夹角的余弦值;
(2)求点E到平面PBF的距离.
您最近一年使用:0次