在△ABC中,角A、B、C所对的边分别为a、b、c,
.
(1)求
的值;
(2)若
,求bc的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baf623a808eaaef1acef2bd44d92d34a.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c54399cfb59213a484664d7fd44018.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
更新时间:2024-04-30 12:45:28
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【推荐1】在
中,角
的对边分别是
,满足
,
.
(1)求
的值;
(2)若
,过点
作
,垂足为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bbf7cc4a21928cf83992b731cbfd66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd84dc6048c6fe099785155eabd5f7eb.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0bb9e49f8f8a2cd06311bbc45eaadd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b51dde13f7671ac8d71a4eee55d267d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c81694d5be9f0e1f9aff1369352ecf.png)
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【推荐2】如图所示,在
中,内角A,B,C的对边分别是a,b,c.满足
,且
,D在AC上,
.
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805285166178304/2806758153699328/STEM/1e707e3c-8a7d-4ae2-a714-06074a3cbec0.png?resizew=284)
(1)若
,求
;
(2)若
,求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9d49211f9fd5f7d73bf86008f627d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://img.xkw.com/dksih/QBM/2021/9/10/2805285166178304/2806758153699328/STEM/1e707e3c-8a7d-4ae2-a714-06074a3cbec0.png?resizew=284)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3d08f0ab6e573253450e03427e13db1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d78524f98b01fa1dadfd277939665b9.png)
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【推荐3】已知函数
的部分图像如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/b0c7816d-6493-4b7d-b9af-c84448697c20.png?resizew=196)
(1)求
的解析式及对称中心;
(2)若
,求
值;
(3)先将
的图像横坐标不变,纵坐标缩短到原来的
倍,得到函数
图像,再将
图像右平移
个单位后得到
的图像,求函数
在
上的单调减区间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68690850090b3052a56518decebb56a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/b0c7816d-6493-4b7d-b9af-c84448697c20.png?resizew=196)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a77f584b0bed4703789fcf9b6e8332c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da69c644380e5ee94ed01db0e82b9d4.png)
(3)先将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cfa1e7ffae662aefb49a44c52d4954d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89eea593c79973e97f6f3cdf621cdfc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89eea593c79973e97f6f3cdf621cdfc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e7b5abfa067567b6a48f541d87fe4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6b2241311b4a898f26b9b77745decb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7e8898fa3497cf5f3db3ca01abcad3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc4eecc61bd23e51024d8759fb29950.png)
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【推荐1】设
的内角A、B、C所对的边分别为a、b、c,已知
,且
.
(1)求角C的大小;
(2)若向量
与
共线,求a,b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb5bac75f36bb1dc5c8190d4dbe681d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38b153f9437ce90f5563cc6164b3755.png)
(1)求角C的大小;
(2)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c74c3b99a45c1155367c380acef3de6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65b492be5796471c49e2f4eee4b3f7de.png)
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【推荐2】在△ABC中,已知
.
(1)求∠A的大小;
(2)请从条件①:
;条件②:
这两个条件中任选一个作为条件,求cosB和a的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27dd4ab6ac564bdac6659ff8990666a.png)
(1)求∠A的大小;
(2)请从条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ef6f920cf01e61596caa2243af1619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6cf53ea977a1dda62c7fe3a664c47b.png)
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【推荐1】在
中,角
的对边分别是
,已知
.
(1)证明:
;
(2)若
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7af7c5df749c6fa9bbe87faa72c66d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f2599ca8b6b683e57a82699c8b1ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208a4c388e34828499176c5bedeab16c.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0f5f8d095ba277cd5e6409c4fdd81a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b64af28c24767dd9a64e49e5948c806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】已知定义在区间
的函数
图象关于
轴对称,且当
时,
.
(1)求函数
的解析式;
(2)若函数
有两个不同的零点
、
,证明不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04614d0fac9cde995374a43d4323b723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed1d8801fe7954ea2afc6fb1123e070.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a13d431118fccb150d02338122ac73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d4dbad1e1d10071bc0ee7cf178ae24.png)
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【推荐3】提高隧道的车辆通行能力可改善附近路段高峰期间的交通状况.一般情况下,隧道内的车流速度
(单位:千米/小时)和车流密度
(单位:辆/千米)满足关系式:
研究表明,当隧道内的车流密度达到120辆/千米时会造成堵塞,此时车流速度为0千米/小时.
(1)若车流速度
不小于40千米/小时,求车流密度
的取值范围;
(2)隧道内的车流量
(单位时间内通过隧道的车辆数,单位:辆/小时)满足
.求隧道内车流量的最大值(精确到1辆/小时)及隧道内车流量达到最大时的车流密度(精确到1辆/千米).(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ad26f4dd3fb60e1e23c1888199c14a.png)
(1)若车流速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)隧道内的车流量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290bfbbc7a50c26ea8f189367fd6514a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafbcf15aeb64e302d398be3a2442855.png)
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