在正方体
中,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/715916c3-f07a-405f-b7af-e13f114397e9.jpg?resizew=185)
(1)求异面直线
与
所成角;
(2)平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/715916c3-f07a-405f-b7af-e13f114397e9.jpg?resizew=185)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
(2)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace37b88d4fb2db252d449fa6c5b4993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
更新时间:2020-07-22 06:29:23
|
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,在
中,
,斜边
.
可以通过
以直线AO为轴旋转得到,且二面角
是直二面角.D是AB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/4c722547-aa52-43f9-a6de-7e5fa9ab3340.png?resizew=140)
(1)求证:平面
平面AOB;
(2)求异面直线AO与CD所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/991c8373be20b4325ba779e4dfdc8b15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864aa0f490f42c358d1550c99bd81c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a19c1bcb8431ae315ecd29c6478d3eff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/4c722547-aa52-43f9-a6de-7e5fa9ab3340.png?resizew=140)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a55c40bb7437081d8e669974c8d1b7.png)
(2)求异面直线AO与CD所成角的余弦值.
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解答题-问答题
|
较易
(0.85)
【推荐2】如图,在长方体
中,
,
.求
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016899180773376/3018809351200768/STEM/697333a966dc4d07b78a341d1ae35ed9.png?resizew=239)
(1)求直线
和直线
所成的角的大小;
(2)求直线
与平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9d26aa29b3abf4889d939987d5f091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6c974c58cc3de2146e5a8db99167f9b.png)
![](https://img.xkw.com/dksih/QBM/2022/7/6/3016899180773376/3018809351200768/STEM/697333a966dc4d07b78a341d1ae35ed9.png?resizew=239)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐1】如图,
分别是正方体
的棱
,
的中点,棱长为
,
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
//平面
.
(2)求正方体
外接球的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f8accdb21a85e7251360bdb6b6953a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/2018/10/15/2054218165444608/2056842180444160/STEM/a80366311ce741b3a5ce8e015955de6c.png?resizew=179)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a89851b6a4fe58a8a042d6a97c4eb317.png)
(2)求正方体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
您最近一年使用:0次
解答题-证明题
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较易
(0.85)
解题方法
【推荐2】如图,已知a、b是异面直线,
平面
,
平面
,且
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b38aa358fe97b47a1d2cb32ffa1f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29acfee233f0903449ca2da4960b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727762c06eb504331d69cb33e43979d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008d1d0cbb3e1b405df3e67350372d76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/202af51f5ebe87ec0017f439a6ad7fbf.png)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962141999013888/2962853384036352/STEM/4e1ad80a-2238-41b7-9e69-a778f0ed83d2.png?resizew=207)
您最近一年使用:0次