在①
且
,②
,③
这三个条件中任选一个,补充在下面问题中,并解答该问题.
问题:锐角
的内角
的对边分别为
,
且_________.
(1)求A;
(2)求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e62315a213f2c15d3a345c7ac5396c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7dced91de1b8c38aa95ffee0e5dc202.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8391a30a191b22e483db135fd476cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ede0a9a3bd8f24316247a5a0cd60adb.png)
问题:锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/5b4c08559eb294e94c1ecc9cb1cf4720.png)
(1)求A;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a5801e8be81aae66c47cc058fe370c.png)
更新时间:2022-03-29 14:01:10
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解答题-问答题
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适中
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【推荐1】在
中,角
的对边分别为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c409bbb228c8d70feae330c955ed252.png)
(1)求
;
(2)若
求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3568fe87758bcd0f991b674b46223fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f13a05f5aca98574bb1f927123490de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c409bbb228c8d70feae330c955ed252.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa6361e919ac07ee6ed642556e1d1ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e68e3c3ff8e178f06a9744db559c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ff214d99784c6b23b7784bdaf3ed37a.png)
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【推荐2】已知函数
.
(1)求函数
的单调递增区间和最小正周期;
(2)填写由函数
的图象变换得到
的图像的过程:
先将
图象上的所有点______,得到
的图象;
再把
的图象上的所有点,纵坐标不变,横坐标______,得到
的图象.
(3)若当
时,关于
的不等式
______,求实数
的取值范围.
请选择①和②中的一个条件,补全问题(3),并求解.
其中,①有解;②恒成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895bfc8e36b398e75849000ae45ec4bc.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)填写由函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a09926b9ee45adb27db40d91306684d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
先将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a09926b9ee45adb27db40d91306684d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13ad0a235941adebbae5765e0fcb767.png)
再把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13ad0a235941adebbae5765e0fcb767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631c15824630ab8506ce172459824362.png)
(3)若当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9105ca8bf7775f0efcb7bb8c6d80cad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc99846cc58c8b63e1c305397889118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
请选择①和②中的一个条件,补全问题(3),并求解.
其中,①有解;②恒成立.
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解题方法
【推荐1】已知
,
,
分别为
内角
,
,
的对边,
.
(1)证明:
;
(2)请问角
是否存在最大值?若存在,求出角
的最大值;若不存在,说明理由.
![](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/0faed94a64b2dcfc6801b4fca0f16675.png)
![](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/1515160f071e28a8743f7153d880a8ef.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c580618830e9d1a0809341cc976d48.png)
(2)请问角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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解题方法
【推荐2】在锐角
中,角A,B,C的对边分别为a,b,c,已知
..
(1)求B的值;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d06bbdee8584f8f3aa4ee733e3fb8769.png)
(1)求B的值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a10eaf76b054db79eeb809932fb2fe0.png)
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【推荐1】“精准扶贫,修路先行”,为解决城市A和山区B的物流运输问题,方便B地的农产品运输到城市A交易,计划在铁路AD间的某一点C处修建一条笔直的公路到达B地.示意图如图所示,
千米,
千米,
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百元.为了求总运费
的最小值,现提供两种方案建立函数关系,方案1:设
千米;方案2:设
.
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728844525436928/2763381872025600/STEM/da1dff13-1d5e-4a97-bcfc-47660ced5353.png?resizew=203)
(1)试将
分别表示为关于
、
的函数关系式
和
;
(2)请只选择一种方案,求出总运费
的最小值以及此时
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80739f2486099ffd39a3038c60f41825.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff83a75900ae3d07bbb4eda227b449cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bfc0387785bf3c60f75ed3d34cc98a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1950345548fe750b80ce79b168969ca.png)
![](https://img.xkw.com/dksih/QBM/2021/5/25/2728844525436928/2763381872025600/STEM/da1dff13-1d5e-4a97-bcfc-47660ced5353.png?resizew=203)
(1)试将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634f1a6094deeafc4c3de8277d85ce6.png)
(2)请只选择一种方案,求出总运费
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】在△ABC中,内角A、B、C的对边分别为a、b、c,且满足b2=ac,cosB=
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(2)设
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(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/303706f2764f1faaa2b278536e94fe92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edf129eef44c8b71fb536578ae5c2cbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/103070abee09399f1e9510a75c3ba9e8.png)
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解题方法
【推荐1】在△ABC中,已知
.
(1)若点D为AB的中点,
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(1)若点D为AB的中点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5deb5430b7d69aa02b399a1c87cadd0.png)
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(2)若不等式
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【推荐2】已知函数
.
(1)求函数
的对称中心;
(2)在锐角三角形
中,
,求三角形
面积的最大值.
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(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)在锐角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6d4aa4c89376711d1824049a667cda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
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