如图,在正方体
中,点
在线段
上运动,有下列判断:
①平面
平面
;
②
;
③异面直线
与
所成角的取值范围是
;
④三棱锥
的体积不变.
其中,正确的是__________ (把所有正确判断的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/fe6a073b-e852-43f9-a491-204004ddc387.png?resizew=156)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de519cf53a0ee323e3382a0048c3751e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e3e58e5d7cdd7c90360e14a9d0c214.png)
③异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572bcf8a6fa788eb7fce7532a406fed1.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23e623d7180e345393af2fcde4e9c2b.png)
其中,正确的是
更新时间:2023-12-27 10:55:16
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐1】正四棱锥P-ABCD,底面边长为2,此四棱锥的体积为
,则二面角P-AB-C为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】如图,矩形
中,
,
,
为
中点,
,
分别在线段
,
上运动,且
,沿
将
折起,得到三棱锥
,当三棱锥
体积最大时,直线
与平面
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb5f97d47fbb49fcfcdc7f5e882a80b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e37c2eab3fa989d8e986b7356eeb4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313139943de52bb9462244c7d2ab82ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313139943de52bb9462244c7d2ab82ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://img.xkw.com/dksih/QBM/2020/7/11/2503783001292800/2505230691614720/STEM/7bff67be968645eb9b4caa681fe1d6ec.png?resizew=189)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】菱形
平面
,
,则
与
的位置关系是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d0c77ac887122cac6821889444bd77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e35f3a470885d88519e1a71db4b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
名校
解题方法
【推荐2】如图,正方体
的棱长为4,点
在正方形
的边界及其内部运动.平面区域
由所有满足
的点
组成,则
的面积是______ .四面体
的体积的取值范围______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53e5fbec5c0af3391c7e18f47335e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aab98011d732d4094e4e881b0bd2bd6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/8/2953537709187072/2954476920406016/STEM/b111ae26-f21a-4c62-aa1d-bdc4213e64a0.png?resizew=193)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】如图一副直角三角板,现将两三角板拼成直二面角,得到四面体
,则下列叙述正确的是___________ .
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894275539124224/2896651849662464/STEM/92a58e98-9a46-4720-b869-09ecccc825be.png?resizew=310)
①平面
的法向量与平面
的法向量垂直;
②异面直线
与
所成的角的余弦值为
;
③四面体
有外接球且该球的半径等于棱
长;
④直线
与平面
所成的角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/14/2894275539124224/2896651849662464/STEM/92a58e98-9a46-4720-b869-09ecccc825be.png?resizew=310)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
②异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cb57b942813635ef4e4c3bea67928f.png)
③四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
④直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】在正方体
中,点
、
分别在
、
上,且
,
,则下列结论:①
;②
;③
平面
;④
,其中,正确命题是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac6dc7db36d0930ab38eee9b1aac697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee33aff2a85e95570ab759bd0966023e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c2ccb5a8a2b3bed5cb127b6ffc6dc57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335aecc9b133dbab45e455ab3858cd0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acacf22dfa4817a91572a0304996fba9.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在直三棱柱
中,
,
,
,
是线段
上一点,且
平面
,则直线
与
所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e55b54a13f8a9f66fdf9d0ff7cf82e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cb62f4c1e0e023619922eb8a509c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbc7e774e4ae40c23bf4ceed179230ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2017/3/7/1638704566247424/1656268033146880/STEM/76fffac0264f477c9492e2a395e3092e.png?resizew=184)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
解题方法
【推荐2】现有四棱锥
(如图),底面ABCD是矩形,
平面ABCD.
,
,点E,F分别在棱AB,BC上.当空间四边形PEFD的周长最小时,异面直线PE与DF所成角的余弦值为___________ .
![](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/0e7b6d04f024ca05cdfacc8ce9137c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975744591020032/2977039528509440/STEM/9f4d53a8-b382-4fe6-8f12-71d023aca058.png?resizew=209)
您最近一年使用:0次