在如图所示的试验装置中,两个正方形框架
的边长都是2,且它们所在的两个半平面所成的角为
.活动弹子
分别在正方形对角线
和
上移动,且
.
(1)用
表示出
的长度,并求出
的长的取值范围;
(2)当
的长最小时,平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9f1d8b6eead1dc79af156d6a113431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/461c44b06295b3104b1e739fc4235a5d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/5e529047-68d2-47fd-a8c9-c396cae42c63.png?resizew=181)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cb18c10820d927ecd53326f58aaf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee5a94f9063a71581f409e47ebaf602.png)
23-24高二上·辽宁·期中 查看更多[2]
更新时间:2023-11-03 23:20:06
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解答题-问答题
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【推荐1】已知二次函数
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.
(1)求
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(2)设函数
在
上的最小值为
,求
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(1)求
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(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973852dec155d3b5b9a1ac6df48c04e6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1987ecbd076d89da5ef1e2561d79d857.png)
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解答题-应用题
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适中
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解题方法
【推荐2】红外线治疗仪的治疗作用是在红外线照射下,组织温度升高,毛细血管扩张,血流加快,物质代谢增强,组织细胞活力及再生能力提高,对我们身体某些疾病的治疗有着很大的贡献,某药店兼营某种红外线治疗仪,经过近
个月的营销,对销售状况进行相关数据分析,发现月销售量与销售价格有关,其统计数据如下表:
(1)根据表中数据求
关于
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(2)①每台红外线治疗仪的价格为
元时,预测红外线治疗仪的月销售量;(四舍五入为整数)
②若该红外线治疗仪的成本为
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元).
参考公式:回归直线方程
,
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
每台红外线治疗仪的销售价格: | |||||
红外线治疗仪的月销售量: |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)①每台红外线治疗仪的价格为
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②若该红外线治疗仪的成本为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
参考公式:回归直线方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/929ef3bed0a4bdd22f39e036506dc481.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dde27ec32c584993dbad7cbd3f3ef1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f7d6a7230549f924abffa2b410de75.png)
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【推荐1】设
的内角
的对边分别为
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(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c5f230e4b90954a11db30652d9efeb4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6bdfb0e1be5583e794ab614a8abe1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】记
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(1)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1469989af1c27f3ac325dc0b36489747.png)
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(1)求
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解答题-证明题
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【推荐1】在四棱锥
中,底面是边长为2的菱形,
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(1)证明:
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9829fc6685b59fdc609f32f30ebd9e6d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334b0be972ebf5a46333c0c4369aa90a.png)
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【推荐2】如图,在四棱锥P-ABCD中,底面ABCD为矩形,△PAD是边长为2的正三角形,平面PAD⊥平面ABCD,E为棱PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/21cf22b1-c708-4d0d-a1b7-2324efde1c62.png?resizew=174)
(1)求证:AE⊥平面PCD;
(2)若直线PC与平面ABCD所成角的正切值为
,求侧面PAD与侧面PBC所成二面角的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/21cf22b1-c708-4d0d-a1b7-2324efde1c62.png?resizew=174)
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