如图,正方体
边长为
,
是
上的一个动点.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/e4d9666a-a845-497a-a888-67bdd3f7bb9b.png?resizew=162)
(1)直线
与平面
所成角的余弦值;
(2)
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8eb4a9f462ca0c1d49c3fe91e720d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/e4d9666a-a845-497a-a888-67bdd3f7bb9b.png?resizew=162)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6045e63d546611337952d20f6d9876.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a51a8d10345f567e0f2daf18529d42f0.png)
2023·江苏苏州·模拟预测 查看更多[2]
更新时间:2023-12-19 19:29:40
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在直三棱柱
中,
,
,
.
(1)求异面直线
与
所成角的余弦值;
(2)若点P是线段
上的动点,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a0946888ae70f1d37116c2d3867720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bc235df1d3cf1b65050cd1907590cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be3d85716c301231663fd71b697a4a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/d0ec0dd5-8986-4274-8139-a3f103c12d42.png?resizew=171)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
(2)若点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64335ca7a84a7b6711ca2cb531ed94a1.png)
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解答题-问答题
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适中
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解题方法
【推荐2】一个正方体的平面展开图及该正方体的直观图的示意图如图所示.
(1)请将字母
,
,
标记在正方体相应的顶点处(不需要说明理由);
(2)判断平面
与平面
的位置关系,并证明你的结论;
(1)请将字母
![](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)
(2)判断平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73cc4309dcef077fbcf60099f47b7b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ea3d743f8f55357958e5a6e0bc2a14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/9696393d-8c57-4d58-9487-df7a6126ab55.png?resizew=232)
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【推荐1】已知三棱锥
中,
、
、
两两互相垂直,且长度均为1.
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877362589736960/2878134137905152/STEM/768d784b81f046f5a5a91c2bd39fd2f7.png?resizew=244)
(1)求三棱锥
的全面积;
(2)若点
为
的中点,求
与平面
所成角的大小.(结果用反三角函数值表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://img.xkw.com/dksih/QBM/2021/12/21/2877362589736960/2878134137905152/STEM/768d784b81f046f5a5a91c2bd39fd2f7.png?resizew=244)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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解题方法
【推荐2】如图所示,
.在平面
内,
是
的斜线,
.求
与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd88acaf36eb1db328fef1ee6172b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/f0d34c2b-8a79-4c1a-86dc-554da737ead5.png?resizew=250)
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(0.65)
名校
【推荐3】如图,在三棱柱
中,侧面
为菱形,
为
的中点,
为等腰直角三角形,
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/1fb2883e-2c74-4026-84db-2ae5d32e86d6.png?resizew=193)
(1)证明:
平面
.
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4357216fbd755327c16ef5cb9803b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2919a662cb6d59eac9aa5cdd69dac847.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/1fb2883e-2c74-4026-84db-2ae5d32e86d6.png?resizew=193)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
您最近一年使用:0次