如图,为连接赣江两侧的人口稠密区
(假设河的两岸呈平行状),南昌市政府计划投资建设一条过江通道
,且
为钝角.若江面宽
,两个人口稠密区
直线距离为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/3c3514e0-8fcd-4209-8b3f-2a2729e3ce9e.png?resizew=262)
(1)过
作
交直线
于
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb170be8bc7ecb599eeb9f036c036025.png)
,请用
表示
;
(2)已知通道的地面道路部分
的拆迁安置及道路修建等费用约为
亿元/千米,通道的水下隧道部分
修建费用约为
亿元/千米,那么点
设在何处可使总造价最低?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4309cc517da10cf325b0003e50d8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4ebc031a3390938b995763c75d1112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc73fea9dd49921cac89b2a2df542ef6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/3c3514e0-8fcd-4209-8b3f-2a2729e3ce9e.png?resizew=262)
(1)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb170be8bc7ecb599eeb9f036c036025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f12389603354eee2ec0e4d3acc69e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
(2)已知通道的地面道路部分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92cb9a526f2b146415a98051b4e58b42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2021-01-09 21:50:43
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名校
【推荐1】已知函数
.
(1)求出该函数的单调递减区间;
(2)当
时,
的最小值是
,最大值是
,求实数a,b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a591ad6b1b2f1afe8ac1bf928aaaf0d.png)
(1)求出该函数的单调递减区间;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48434bdcafb5e084fc0b6396cb9469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐2】已知函数
,当
时,
.
(1)求常数
的值;
(2)设
,且
,试求
的单调递增区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e252c4ebf760f8131bfd292bb6f8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb48434bdcafb5e084fc0b6396cb9469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ad31739714881d38bc1811ec401aba.png)
(1)求常数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c2007778f61d25301563794d82576b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9626b410b8d66b787e1ddc51a4b79cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
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【推荐3】已知函数
的部分图象如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/b5c9abe3-14c6-41b6-aeba-a29456e10d4f.png?resizew=167)
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(2)设
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在
上存在零点,求实数
的最小值和最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5e2a383cb47eb87493e86c8c40caf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3731e4fe7dbd8899acb023f8647b71af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/b5c9abe3-14c6-41b6-aeba-a29456e10d4f.png?resizew=167)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6581916f5a65edfea257c804efee007e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4388cd8f65e3fafbefc51edc15623e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98fca050c0b3737f691edab481ca532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb935734bfd51c3338f223934a668e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐1】如图,设
是一块麦田,射线
夹角为60°,若将水管
设在
围成的区域内(不含边界)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/1e1b0934-b60c-4165-8a45-bebd8dc85578.png?resizew=168)
(1)若
到
的距离之和为定值20,设
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的长用含
的式子表示,并求出水管想要浇灌到麦田的最小射程;
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的垂线分别交
于
两点,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/1e1b0934-b60c-4165-8a45-bebd8dc85578.png?resizew=168)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513cb0e220a0fed33454151e303bcbe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ca00309261a540934d9b3ed9ba05b6.png)
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【推荐2】摩天轮是一种大型转轮状的机械建筑设施,游客坐在摩天轮的座舱里慢慢地往上转,可以从高处俯瞰四周景色.如图,某摩天轮最高点距离地面高度为
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(2)证明:
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).
(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b339f047c40d01b62ddad00a0c19cd25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba52ced0811df98fedb575535b24257b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffec8485ffd139b3a8af52c4b6760df5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5481d5a5e5f293cb87ce8d5be068097.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d847196d7a43900fb1ea0d95cd6fd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa741bf4347e9b8a43ad8e7f5c5581a0.png)
(3)若甲、乙两人分别坐在两个相邻的座舱里,在运行一周的过程中,求两人距离地面的高度差
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a87796ee30e6c5d5e6b6285b32abe10c.png)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/339965424e648c126447d022a8303708.png)
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解题方法
【推荐1】在
中,锐角
,
,
的对边分别为
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,已知
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(1)求角
的大小;
(2)求
的取值范围.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e701e0fbcbb2406b277c33fd08997d3.png)
(1)求角
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(2)求
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【推荐2】已知曲线C的直角坐标方程是
,把曲线C的点横坐标变为原来的
倍,纵坐标不变,得到曲线E,直线
(t为参数)与曲线E交于A,B两点.
(1)设曲线C上任一点为
,求
的最小值;
(2)求出曲线E的直角坐标方程,并求出直线l被曲线E截得的弦AB长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da078631bd3a182ca2682249d96e824d.png)
(1)设曲线C上任一点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d259822ab64b8626f3893b8432673358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af1ddeed7b35acd5bd47b69ff5a57f38.png)
(2)求出曲线E的直角坐标方程,并求出直线l被曲线E截得的弦AB长.
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【推荐3】已知
,
,设函数
.
(1)当
时,求函数
的值域;
(2)当
时,若
,求函数
的值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c128c6cd0c80b2f1ec9e5589d40beb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0315540f3081c1e6423625fe5457f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2338bbbe3239e016af0bed7ad0bb22a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e12cadc6e1a7797084d8d96933e7572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e12cadc6e1a7797084d8d96933e7572.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe8b0885c18c42e1afbb9381e2a73dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceba333b8cdc6f401a8979bbec86bf44.png)
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