2021·全国·模拟预测
解题方法
1 . 如图,在棱长为2的正方体
中,O为正方体的中心,M为
的中点,F为侧面正方形
内一动点,且满足
平面
,则( )
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882961875247104/2883161547997184/STEM/f172e385-1327-4521-850b-97b6d80bdde0.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ea211a573491409cb60f9fbe9a65cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0a3bb566b5d2404e4bb823abddfa9.png)
![](https://img.xkw.com/dksih/QBM/2021/12/29/2882961875247104/2883161547997184/STEM/f172e385-1327-4521-850b-97b6d80bdde0.png?resizew=179)
A.若P为正方体表面上一点,则满足![]() ![]() |
B.动点F的轨迹是一条线段 |
C.三棱锥![]() |
D.若过A,M,![]() ![]() ![]() ![]() ![]() |
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解题方法
2 . 若直线
、
是平面
内的两条直线,且
、
均在平面
外.则“
,
”是“
”的______ 条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5bbfcfc23f7a2df2c91fe75b757c306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9144adeacf03b4e4f67a8f60923ffa85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384a65ca1ee3d7d86b988ca34c885e18.png)
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3卷引用:上海市七宝中学2021-2022学年高二上学期10月月考数学试题
上海市七宝中学2021-2022学年高二上学期10月月考数学试题(已下线)第04讲线线、线面、面面平行的判定与性质(核心考点讲与练)(2)上海市七宝中学2023-2024学年高二上学期开学摸底数学试题
3 . 已知
为等腰直角三角形,
,
,
分别为
和
上的点,且
,
,如图1.沿EF将
折起使平面
平面
,连接
,
,如图2.
![](https://img.xkw.com/dksih/QBM/2021/9/7/2802926553350144/2803656190033920/STEM/6ab3d0d549a04c9bb12d765487232be3.png?resizew=387)
(1)求异面直线
与
所成角的余弦值;
(2)已知
为棱
上一点,试确定
的位置,使
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13bd9e8b54864ca44115d24a5aeeb83c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/9/7/2802926553350144/2803656190033920/STEM/6ab3d0d549a04c9bb12d765487232be3.png?resizew=387)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd0285afe567ca0b32f0ccafc30167cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
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