某景区为拓展旅游业务,拟建一个观景台P(如图所示),其中AB,AC为两条公路,
,M,N为公路上的两个景点,测得
,
,为了获得最佳观景效果,要求P对的视角
.现需要从观景台P到M,N建造两条观光路线PM,PN,且要求观光路线最长.若建造观光路线的宽为5米,每平方米造价为100元.
(2)设
,用
表示
;
(3)求该景区预算需要投入多少万元改造?(
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc145306ed1be18614524ff750754a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c22544f7247a1755d961c59c6ebfaac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6c2ac0f61045aeedb0115b54466c8e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472e4c3e21079c0cfef3685689e9bb8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
(3)求该景区预算需要投入多少万元改造?(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43d6a47773bbfd65038a08d9f4d7ba62.png)
更新时间:2024-04-24 12:22:24
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解题方法
【推荐1】已知
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451be539a00c5a0fa9e00fc9bf4c39fd.png)
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【推荐2】已知函数
的图像经过点
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(
)求
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(
)在
中,
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,
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,求
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(
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(
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】在△ABC中,a, b, c分别为内角A, B, C的对边,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14426db20d3a02a1c4c2dd35f8f9f1cd.png)
(Ⅰ)求A的大小;
(Ⅱ)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14426db20d3a02a1c4c2dd35f8f9f1cd.png)
(Ⅰ)求A的大小;
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a5801e8be81aae66c47cc058fe370c.png)
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解题方法
【推荐2】
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(I)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573171428671488/1573171434536960/STEM/6cc42b565e954760908ca39c72067601.png?resizew=305)
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9ecc3aaae2aa289591a3b632f1e0645.png)
(II)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】已知四棱锥
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
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【推荐2】锐角
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(1)求
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(2)若
,
的面积为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313c7e7d0521cac3c711c805c76ddfb6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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您最近一年使用:0次
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解题方法
【推荐1】在
中,角
的对边分别为
,满足
.
(1)若
的面积为
,以
为边长的三个正三角形的面积分别为
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(i)求
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(ii)若
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(2)设
的中点为
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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/5b33c37f34396c3ed24f3fcdf25f96a4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa37aefb6d45efe4e20ba48c2e7dfa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf4e20ea341827ce5f9552daee39462.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f77dce691e0233abb05de092b60c7d3.png)
(ii)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cecea7657bb88976926ee41790d49012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd302fa2085cf19bd03f4685866a8df.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454328a8e75953fdb0835ce80d9566e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33012983c8ebaaadc7c13978254311d4.png)
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解题方法
【推荐2】在中,角
,
,
所对的边分别为
,
,
,且满足
.
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6129fbf40a950fc8c516f0abaab21957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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