如图,已知两条公路
的交汇点
处有一学校,现拟在两条公路之间的区域内建一工厂
,在两公路旁
(异于点
)处设两个销售点,且满足
,
(千米),
(千米),设
.
![](https://img.xkw.com/dksih/QBM/2019/5/21/2208460344557568/2209357615939584/STEM/9b5195a7740a411e85e335aff0124479.png?resizew=184)
(1)试用
表示
,并写出
的范围;
(2)当
为多大时,工厂产生的噪声对学校的影响最小(即工厂与学校的距离最远).(注:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c6f95fb0f50d816861bc3a526aee76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f083e7f8aa19ead8dbe26195af2c0b8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1280896017dbeef12abe94a08ad3d839.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b98f42576578185f53d182de7828d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b910d741b7eccb17c1074906dd9eecb.png)
![](https://img.xkw.com/dksih/QBM/2019/5/21/2208460344557568/2209357615939584/STEM/9b5195a7740a411e85e335aff0124479.png?resizew=184)
(1)试用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1165830b314a0dab65ea267e82bd3f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42ce1684a0a63cf3a4a3f3dff58e0a8.png)
更新时间:2018-07-14 09:19:43
|
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您最近一年使用:0次
解答题-问答题
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适中
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【推荐2】如图,我炮兵阵地位于
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/cc3f0330-4c56-43ef-8b97-590ca1e20540.png?resizew=146)
(1)若测得
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/cc3f0330-4c56-43ef-8b97-590ca1e20540.png?resizew=146)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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