如图在小岛的正北方向上
的
处有一艘货轮,为了躲避礁石,该货轮沿南偏西
的方向航行,小岛
有一艘快艇沿北偏西
角方向行驶给货轮运送补给,双方无线电约定在点
处完成补给.货轮得到补给后将原航行方向顺时针旋转
向
地运送物资.
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734330199605248/2745509264318464/STEM/1a40f93654724929abbdd2fbdd4723cd.png?resizew=554)
(1)如图,若
地恰好在小岛
的正西方向上,满足
,求
两地的距离和
的正切值;
(2)如图
,若
地恰好在小岛
的西偏南
方向上,记
,令
,计算当
时,
的值;
(3)如图
,设
的面积为
,计算当
时,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afb7c93cbdc3be446346ecc7f1696d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a468a3f205065a4eac93d46b1c909b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ec10dca211ffb7d7e0c690b5ef4460.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/2021/6/2/2734330199605248/2745509264318464/STEM/1a40f93654724929abbdd2fbdd4723cd.png?resizew=554)
(1)如图,若
![](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/b7f2125dfe51596f77b060572f706cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.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/798fb30c165c5c82d174236acd193041.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0314c25563725d09d2fdd8f37ab48cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09f3fe44cb03b27b994c76c6ec2eb1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706de1dfc08a6b821a43e08d7bf390d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a76b8027a664ebe27b23e6842cbb9fb.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0575a0a359247cbf6ee653e9548cb77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c28ac079a8062edfce9e544c63095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0575a0a359247cbf6ee653e9548cb77c.png)
更新时间:2021-06-18 09:35:48
|
相似题推荐
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐1】在①
,②
这两个条件中任选一个,补充在下面问题中,并求解(1)、(2)的答案.
问题:在
中,三个内角A,B,C所对的边分别是a,b,c,已知 .
(1)求角C;
(2)若点D满足
,且
,求
的面积的最大值.
(注:如果选择两个条件分别解答,则按第一个解答计分.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/690e3a7140ea133626ddfdf313bf0598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4ef786d39c7aa009b4dfe56df0644d9.png)
问题:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)求角C;
(2)若点D满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674f10b713edab9be607e2f93a6ce121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(注:如果选择两个条件分别解答,则按第一个解答计分.)
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【推荐2】在锐角
中,
分别为内角
所对的边,且满足![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c8198179f11102f9f26c8c4b9b3a50.png)
(1)求角
的大小;
(2)若
求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c8198179f11102f9f26c8c4b9b3a50.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4626ba0fa9039e10232ef90b8f86112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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【推荐1】如图,有一位于
处的台风预测站,某时刻发现其北偏东
且与
相距
海里的
处有一台风中心正以匀速直线移动,
分钟后又测得该台风中心位于预测站
北偏东
,且与预测站
相距
海里的
处.已知
,
为锐角.
![](https://img.xkw.com/dksih/QBM/2021/11/3/2843414022021120/2843463458594816/STEM/246716f4cd7a4778ad23a0986e762516.png?resizew=127)
(1)求该台风中心移动的速度
(海里/小时);
(2)在离预测站
的正南方有半径为
海里的圆形小岛,其中心
距离
处
海里,如果台风中心移动速度和方向均不改变,则该小岛是否会受台风影响?若小岛受影响,则受影响时间是否超过
分钟?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb25da5ae554b4e995ff42dc409e781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369557af210f3281a66cdaac861169ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be0d63ca23fa30ee02490d12553f926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c423cfa71956862edbed10a5ba12d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81c3bb3d06bfad822572fb67b00ad49e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://img.xkw.com/dksih/QBM/2021/11/3/2843414022021120/2843463458594816/STEM/246716f4cd7a4778ad23a0986e762516.png?resizew=127)
(1)求该台风中心移动的速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
(2)在离预测站
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
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【推荐2】如图,某地出土一块三角形石器,其一角已破损.为了复原该三角形石器,现测得如下数据:
,
,
,
.(参考数据:取
)
![](https://img.xkw.com/dksih/QBM/2022/9/29/3076785998561280/3080650451345408/STEM/66dc8e2186174fbcb95049a42fcbb4eb.png?resizew=227)
(1)求三角形石器另外两边的长;
(2)求D,E两点之间的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dd838ffc4d8d9bbee7726d9afd5004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700d946aa8e33e2215f20586cb6ff923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6697d16bf90acf1d6faa6bab8ed4e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/153b1e805cf0235ca164f8d192197da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88148bfd93073fc50756c5ecbf5ff45.png)
![](https://img.xkw.com/dksih/QBM/2022/9/29/3076785998561280/3080650451345408/STEM/66dc8e2186174fbcb95049a42fcbb4eb.png?resizew=227)
(1)求三角形石器另外两边的长;
(2)求D,E两点之间的距离.
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【推荐1】某校兴趣小组在如图所示的矩形区域
内举行机器人拦截挑战赛,在E处按
方向释放机器人甲,同时在A处按
方向释放机器人乙,设机器人乙在M处成功拦截机器人甲,两机器人停止运动,若点M在矩形区域
内(包含边界),则挑战成功,否则挑战失败.已知
米,E为
中点,比赛中两机器人均匀速直线运动方式行进,记
与
的夹角为
,
与
的夹角为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5f031fbe09d8ed7d451279f31eb595.png)
足够长,机器人乙挑战成功,求两机器人运动路程和的最大值;
(2)已知机器人乙的速度是机器人甲的速度的2倍
(i)若
足够长,求机器人乙能否挑战成功.
(ii)如何设计矩形区域
的宽
的长度,才能确保无论
的值为多少,总可以通过设置机器人乙的释放角度
使机器人乙挑战成功?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e62758f556745c4089a0b178c6f8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1b0ecc2d8e0164d78e0125953afa2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95e62758f556745c4089a0b178c6f8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d868a22c50b4ad3dae8e438c9779d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d49bc14700562fee13af6a548e4eaef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a1b0ecc2d8e0164d78e0125953afa2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a5f031fbe09d8ed7d451279f31eb595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7015dc4b91cacc1f05d84775affa111c.png)
(2)已知机器人乙的速度是机器人甲的速度的2倍
(i)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e98e8f3c00ec711d79ce30ffcf2f9662.png)
(ii)如何设计矩形区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】位于某海域
处的甲船获悉,在其正东方向相距
的
处有一艘渔船遇险后抛锚等待营救.甲船立即前往救援,同时把消息告知位于甲船南偏西
,且与甲船相距
的
处的乙船,那么乙船前往营救遇险渔船时的目标方向线(由观测点看目标的视线)的方向是北偏东多少度(精确到
)?需要航行的距离是多少海里(精确到
)?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f5114e68fcf8e0bb7159ff60594ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31594ba0d96de5d3d4951176fe9030a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7705384a6eecb13e039f3134e9204e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834b1eb8289cd3315bb3fc0356241782.png)
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