如图1,一艺术拱门由两部分组成,下部为矩形
,
的长分别为
和
,上部是圆心为
的劣弧
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/347b2c02-ea0a-44a6-9d89-3c2fabaa4001.png?resizew=555)
(1)求图1中拱门最高点到地面的距离;
(2)现欲以B点为支点将拱门放倒,放倒过程中矩形
所在的平面始终与地面垂直,如图2、图3、图4所示.设
与地面水平线
所成的角为
.记拱门上的点到地面的最大距离为
,试用
的函数表示
,并求出
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0672348c4f88d498379f9e8b64b73f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4eb38ff61b8a7506efae5013601376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f9b9fa429b898664b0e5ffa88810d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441f0f79837fa1e0faf6bc7bdc3c2f4e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/347b2c02-ea0a-44a6-9d89-3c2fabaa4001.png?resizew=555)
(1)求图1中拱门最高点到地面的距离;
(2)现欲以B点为支点将拱门放倒,放倒过程中矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
更新时间:2019-02-20 15:51:08
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解答题-问答题
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适中
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解题方法
【推荐1】如图,已知长方形
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分别为
的中点,将平面
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平面
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,设
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(1)求函数
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(2)求函数
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
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(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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【推荐2】已知函数
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(1)讨论
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(2)若不等式
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35dc2fc04b0364a1052e365473a8f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aff8d9b6533ff319420cdc5e8740b04.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f13daefedb10f5c4a0aed88f4fc9d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58e82c4003d20b36777f7aea584e3dd4.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】在自然条件下,对某种细菌在一天内存活的时间进行了一年的统计与测量,得到10次测量结果(时间近似到0.1小时),结果如表所示:
(1)试选用一个形如
的函数来近似描述一年(按
天计)中该细菌一天内存活的时间
与日期位置序号
之间的函数解析式.
(2)用(1)中的结果估计该种细菌一年中大约有多少天的存活时间大于
小时.
日期 |
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日期位置序号 | ||||||||||
存活时间 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/753ef663b31960b6de577b97a0867048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f16af56e5eac44c69d041fbcd0c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)用(1)中的结果估计该种细菌一年中大约有多少天的存活时间大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f79c2aa0dea67671082b5e6e5841b4d.png)
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【推荐2】国家提倡工匠精神,珠宝行业对宝石的切割力求完美,以更好地展现宝石的魅力.如图1是一幅宝石切割效果图的侧面平面图,展示的是将一块圆心角为
,半径为
的扇形图,计划切割成顶部为等腰梯形的形状,即图2的形状,其中
交CD于点M,交AB于点N.切工的效果由很多参数衡量,冠高比就是其中一个,指的是宝石冠部高度与腰围直径的百分比,即
,t的数值范围在区间
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/e642f7a2-86b9-4811-a58f-2fdd350414f4.png?resizew=352)
(1)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
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(1)设
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名校
解题方法
【推荐3】如图,有一生态农庄的平面图是一个半圆形,其中直径长为2km,C、D两点在半圆弧上满足
,设
,现要在景区内铺设一条观光通道,由
和
组成.
![](https://img.xkw.com/dksih/QBM/2020/9/22/2555435640881152/2557953052557312/STEM/580284d9-f935-4de7-b37b-a64e685d3d5f.png)
(1)用
表示观光通道的长
,并求观光通道
的最大值;
(2)现要在农庄内种植经济作物,其中在
中种植鲜花,在
中种植果树,在扇形
内种植草坪,已知种植鲜花和种植果树的利润均为
百万元/km2,种植草坪利润为
百万元/km2,则当
为何值时总利润最大?
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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(2)现要在农庄内种植经济作物,其中在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f5f078c32f5caf439bac951d450fda.png)
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