名校
解题方法
1 . 已知三棱锥
中,
为
中点,
平面
,
,
,则下列说法中正确的序号为______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/2052f3d8-db71-4f66-8cd5-3c74dc5dda63.png?resizew=156)
①若
为
的外心,则
;
②若
为等边三角形,则
;
③当
时,
与平面
所成角的范围为
;
④当
时,
为平面
内动点,若
平面
,则
在
内的轨迹长度为2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a9b8e7befcb7881c294070175b1a554.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/2052f3d8-db71-4f66-8cd5-3c74dc5dda63.png?resizew=156)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbad7ad1465d1c4c177e3321e6ed12a.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4b7b3579e3fca43ead7487c73b62c2.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75844725734f498eb983fe76cece2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
您最近一年使用:0次
2021-09-10更新
|
399次组卷
|
4卷引用:云南省富宁县第一中学2020-2021学年高二下学期第三次月考数学(文)试题
名校
解题方法
2 . 如图,在正方体
中,点P为AD的中点,点Q为
上的动点,给出下列说法:
![](https://img.xkw.com/dksih/QBM/2019/4/12/2180779789303808/2182429130899456/STEM/54c156a7-529c-48dc-834a-5c51083ae3be.png)
可能与平面
平行;
与BC所成的最大角为
;
与PQ一定垂直;
与
所成的最大角的正切值为
;
.
其中正确的有______
写出所有正确命题的序号
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a915e56c163363f55a2d54e417299a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846a84e40de724b4c60a20c4faa194b9.png)
![](https://img.xkw.com/dksih/QBM/2019/4/12/2180779789303808/2182429130899456/STEM/54c156a7-529c-48dc-834a-5c51083ae3be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6380036f99e6c7c618b59c3fc9259e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf7b618c5571a392c3f5dfffecf52715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92c1ed5743d650d2aa6aed01cf39dfe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65af1d6b6b831ebbdc36dda5f304a3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5466bd6250733b401d7c1ab7f3405162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36518aa890bc426ddead2044edaa8b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd8089bf8a278810573965bc1fb919b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5648b5097a94d48710a7589ce11044f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dd4bae59d3ebf6909dc0173fa16ee3.png)
其中正确的有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ce8411079aca57f17d3ead32798f055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
您最近一年使用:0次
2019-04-14更新
|
1326次组卷
|
2卷引用:【全国百强校】云南省昆明市云南师范大学附属中学2019届高三上学期第四次月考数学文科试题
3 . 如图,在正方体
中,点
在线段
上移动,有下列判断:①平面
平面
;②平面
平面
;③三棱锥
的体积不变;④
平面
.其中,正确的是______ .(把所有正确的判断的序号都填上)
![](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/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0f8ab808f594f9d202692b3d3b10ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4508dc6d9c91157836be679c0543cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0967be82a243f285728d50e7b81332f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4508dc6d9c91157836be679c0543cac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad253c20630cb956229ee3431fc8be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3ec3133707610164d237ac979a268d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4508dc6d9c91157836be679c0543cac.png)
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370738235064320/2371404224421888/STEM/60ed8df41e8c44b48e6e147ec840cff0.png?resizew=117)
您最近一年使用:0次
2020-01-06更新
|
1403次组卷
|
10卷引用:云南省大理州2021届高三二模数学(理)试题
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