1 . 四棱锥
的底面
为直角梯形,
,
,
,
为正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/2cd2f3b1-c9b9-4e41-b225-413af7fbaa64.png?resizew=167)
(1)点
为棱
上一点,若
平面
,
,求实数
的值;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f72900e99805cc33b49290b34fdea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086b195fa3c01695809ba94ddf0261aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef28980a58fac0437cbe113ec46e1d39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/398879056abf1394e7d16da065eaca41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/2cd2f3b1-c9b9-4e41-b225-413af7fbaa64.png?resizew=167)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f8b463fcecf0a757f386db56e074d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4049cbab185d39f80f4fe731c65def78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/144bb8de12e89335139d7b3953c39eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13c62e7c58606b2250c6d189d85a6ea8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29652f66e456c162313cda301712f929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
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2019-01-03更新
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5卷引用:黑龙江省七台河市勃利县高级中学2021-2022学年高三上学期期中考试数学(文)试题