如图,一艘渔轮在航行中遇险并发出呼救信号.我海军舰艇在A处获悉后,测出该渔轮在方位角①为45°、距离为10nmile的C处,并测得渔轮正沿方位角为105°的方向,以9nmile/h的速度向小岛靠拢.我海军舰艇立即以21nmile/h的速度前去营救,求舰艇的航向和靠近渔轮所需的时间(角度精确到
,时间精确到
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4c74a88e12936aaa3518764d5fb5192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17166d730bec1b4ee345727b42265ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9191c15d9faaf43187c5289115dddeed.png)
21-22高一·湖南·课后作业 查看更多[3]
更新时间:2022-02-22 20:55:56
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【推荐1】某贫困地区几个丘陵的外围有两条相互垂直的直线型公路
,
,以及铁路线上的一条应开凿的直线穿山隧道
,为进一步改善山区的交通现状,计划修建一条连接两条公路
,
和山区边界的直线型公路
,以
,
所在的直线分别为
轴,
轴,建立平面直角坐标系
,如图所示,山区边界曲线为
:
,设公路
与曲线
相切于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/ae1925ea-73df-485f-8143-1a4d3b1e332c.png?resizew=144)
(1)设公路
交
轴,
轴分别为
,
两点,若公路
的斜率为-1,求
的长;
(2)在(1)条件下,测得四边形
中,
,
,
千米,
千米,求应开凿的隧道
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f37d1aa6b177fdc18ffe8aa058c6a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/ae1925ea-73df-485f-8143-1a4d3b1e332c.png?resizew=144)
(1)设公路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
(2)在(1)条件下,测得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6b41579de11a99e8c8672c44e1247a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35db79eb06bc4973f8ab5a20f5006ab8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1945d7a560e1171df93bf237d218b6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd687b3df76e4f752bcc63778661516.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】
的内角A,B,C所对的边分别是a,b,c,若
,
,
.
(1)求c的值;
(2)求
的面积.
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056327632789504/2059682948448256/STEM/8a4887bc06fd494782617854a60fe18d.png?resizew=40)
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056327632789504/2059682948448256/STEM/f225a17c0773426eaeb0b2a0fbc87adf.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056327632789504/2059682948448256/STEM/698664350c5a4e1f8f98ac6dc6bcfa6c.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056327632789504/2059682948448256/STEM/421ff9e0af9c475b94667713d47bf514.png?resizew=54)
(1)求c的值;
(2)求
![](https://img.xkw.com/dksih/QBM/2018/10/18/2056327632789504/2059682948448256/STEM/8a4887bc06fd494782617854a60fe18d.png?resizew=40)
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解答题-证明题
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解题方法
【推荐1】某种型号汽车四个轮胎半径相同,均为
,同侧前后两轮胎之间的距离(指轮胎中心之间距离)
(假定四个轮胎中心构成一个矩形),当该型号汽车开上一段上坡路
(如图所示,其中
,
),且前轮
已在
段上时,后轮中心在
位置;若前轮中心到达
处时,后轮中心在
处(假定该汽车能顺利驶上该上坡路),设前轮中心在
和
处时与地面的接触点分别为
和
,且
,
;(其它因素忽略不计)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1bcb7fca-1cb3-4e42-aab0-5aa93d42e356.png?resizew=329)
(1)如图所示,
和
的延长线交于点
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e7f4d6badb183ac9cd31e77ef2b4dd.png)
;
(2)当
=
时,后轮中心从
处移动到
处实际移动了多少厘米?(精确到
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd680d922b6a7cccad8fbf84c4441d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2dc2abb1e1dc494b3719ba314e2a0bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13a0055328f2442b42040c3bcb0f847e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f82e6414e130db9bbdee92326eee13a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26afb46c388cfef8e6ed0b66be802571.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/1bcb7fca-1cb3-4e42-aab0-5aa93d42e356.png?resizew=329)
(1)如图所示,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e7f4d6badb183ac9cd31e77ef2b4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21870b0cdc028708ea96bb0628af71e1.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f7a55368936281934788044d18ff0ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96a4fe52baabb3071d55134f157a6079.png)
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【推荐2】如图所示,一辆汽车从
市出发沿海岸一条直公路以
的速度向东匀速行驶,汽车开动时,在
市南偏东方向距
市
且与海岸距离为
的海上
处有一快艇与汽车同时出发,要把一份稿件送给这辆汽车的司机.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/bce7accf-e0c5-473f-b061-1c144323aae7.png?resizew=175)
(1)快艇至少以多大的速度行驶才能把稿件送到司机手中?
(2)在(1)的条件下,求快艇以最小速度行驶时的行驶方向与
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544291d87c360667480d7db95f94096b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32959ed9073fc89c4a575fc24b570d14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c50e6fbefde5964c8d8523b524cb88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/bce7accf-e0c5-473f-b061-1c144323aae7.png?resizew=175)
(1)快艇至少以多大的速度行驶才能把稿件送到司机手中?
(2)在(1)的条件下,求快艇以最小速度行驶时的行驶方向与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐3】某公园为了吸引更多的游客,准备进一步美化环境.如图,准备在道路AB的一侧进行绿化,线段AB长为4百米,C,D都设计在以AB为直径的半圆上.设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0d769a88-9168-4e7f-8fb1-5fb3f46b90f4.png?resizew=171)
(1)现要在四边形ABCD内种满郁金香,若
,则当
为何值时,郁金香种植面积最大;
(2)为了方便游客散步,现要铺设一条栈道,栈道由线段BC,CD和DA组成,若BC=CD,则当
为何值时,栈道的总长l最长,并求l的最大值(单位:百米).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813b1b0327154103afd7a728f00cfeda.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0d769a88-9168-4e7f-8fb1-5fb3f46b90f4.png?resizew=171)
(1)现要在四边形ABCD内种满郁金香,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1dfdfd2e2c671a71e60ea1b1630ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)为了方便游客散步,现要铺设一条栈道,栈道由线段BC,CD和DA组成,若BC=CD,则当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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