名校
解题方法
1 . 如图,已知正方体
的棱长为1,E为棱
的中点,F为棱
上的点,且满足
,点F、B、E、G、H为面MBN过三点B、E、F的截面与正方体
在棱上的交点,则下列说法错误的是
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056268235685888/2057566685880320/STEM/c53266d5-7634-4d47-8716-dae5b6543d4b.png?resizew=345)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40863968c33b12a827c8948be66c0f93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056268235685888/2057566685880320/STEM/c53266d5-7634-4d47-8716-dae5b6543d4b.png?resizew=345)
A.HF//BE | B.![]() |
C.∠MBN的余弦值为![]() | D.△MBN的面积是![]() |
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名校
2 . 若
,
,
,满足:
,
,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d93ff828199006191b58f7cfe430c439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e45d54b121fdb6ece00c167f79affe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f71e1a5c60a26f1585d9b81131cfcbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8adcdfb8cc2e8162350f86b29a993f20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b4f4d470d42a016589b07f385f65f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ca41c520e1ae90775f50af5db1a97c.png)
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3 . 在数1和2之间插入
个正数,使得这
个数构成递增等比数列,将这
个数的乘积记为
,令
,
,
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3468a665ac713ab7b400c672f19650a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3468a665ac713ab7b400c672f19650a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f51d87e81c4d7c2df9f7bf9fe9fa31f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5c3dfa276f2032f32083d8dd6d6b10.png)
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