名校
解题方法
1 . 如图,直三棱柱
底面
中,
,
,棱
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/10/28/2839171824746496/2839633484333056/STEM/5c2ad36b-991b-4d00-8647-0fda9b878028.png?resizew=204)
(1)求
,
的值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca38004c7744a7567bef30f0674fe60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/2021/10/28/2839171824746496/2839633484333056/STEM/5c2ad36b-991b-4d00-8647-0fda9b878028.png?resizew=204)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35cb5861da7c6bce0571998ff24e70d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c254c575cdab143dec0464f10b6975f4.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b201f1e798eb74963b98f2b0da4132.png)
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2021-10-29更新
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434次组卷
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5卷引用:甘肃省金昌市永昌县第一高级中学2021-2022学年高二下学期期中数学(理)试题