名校
解题方法
1 . 某规划部门拟在一条河道附近建设一个如图所示的“创新产业园区”,已知整个可用建筑用地可抽象为
,其中折线
为河岸,经测量河岸拐弯处
,
千米,且
为等腰三角形.根据实际情况需要在该产业园区内再规划一个核心功能区
,其中M、N分别在
、
(不包括端点)上,P为
中点,且
,设
.
![](https://img.xkw.com/dksih/QBM/2020/11/18/2595175103086592/2599687431503872/STEM/f04103ce07da4470b4ccd1023c770e42.png?resizew=235)
(1)若
,求
的长度;
(2)求核心功能区
的面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9673cb91a7efbc4abaa7124ab986bf1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d631d1d58f4b8007b9a57d6c77d6063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b05bf23fc23d66e05af9eb79a7a7d17.png)
![](https://img.xkw.com/dksih/QBM/2020/11/18/2595175103086592/2599687431503872/STEM/f04103ce07da4470b4ccd1023c770e42.png?resizew=235)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/734a6a1d319648bb969845a9159cdba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)求核心功能区
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ed4c4e8edbd179f3fc38a6653f18c1.png)
您最近一年使用:0次
2020-11-24更新
|
935次组卷
|
5卷引用:重庆市南开中学校2021届高三上学期第三次质量检测数学试题
重庆市南开中学校2021届高三上学期第三次质量检测数学试题(已下线)大题专项训练3:解三角形(面积的最值)-2021届高三数学二轮复习重庆市第一中学2020-2021学年高一下学期期末数学试题(已下线)第六章 解三角形专练6—取值范围、最值问题2(大题)-2022届高三数学一轮复习重庆市缙云教育联盟2021-2022学年高一下学期6月质量检测数学试题
名校
解题方法
2 . 重庆、武汉、南京并称为三大“火炉”城市,而重庆比武汉、南京更厉害,堪称三大“火炉”之首.某人在歌乐山修建了一座避暑山庄
(如图).为吸引游客,准备在门前两条夹角为
(即
)的小路之间修建一处弓形花园,使之有着类似“冰淇淋”般的凉爽感,已知弓形花园的弦长
且点
,
落在小路上,记弓形花园的顶点为
,且
,设
.
,
用含有
的关系式表示出来;
(2)该山庄准备在
点处修建喷泉,为获取更好的观景视野,如何规划花园(即
,
长度),才使得喷泉
与山庄
距离即值
最大?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84cef568cfe2fc12a4dec11533ada274.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c5c26795dd1d7bd5cebaa980a594512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7d95b6bf37b18d4e11d4d1464244b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)该山庄准备在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c19fa4cd646f4d877c3e58cc346651.png)
您最近一年使用:0次
2020-10-15更新
|
631次组卷
|
8卷引用:重庆市第一中学2021届高三上学期第一次月考数学试题
2020高三·全国·专题练习
3 . 如图,一条河的两岸平行,河的宽度![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d2a21e4be0a424cef459e1b8dd253b.png)
,一艘客船从码头
出发匀速驶往河对岸的码头
.已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
,水流速度为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
,若客船从码头
驶到码头
所用的最短时间为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
,则客船在静水中的速度大小为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e5bc2f1a-6e6c-4eee-a345-e4b153db298a.png?resizew=200)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d2a21e4be0a424cef459e1b8dd253b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce89b633e5d6bcf9406e3f9208fe06d.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/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ce89b633e5d6bcf9406e3f9208fe06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe20ba65a5a470ca5886b99ff4bcc8e1.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/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508e013a8978e0e67bf1f2bad60a8596.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/e5bc2f1a-6e6c-4eee-a345-e4b153db298a.png?resizew=200)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
4 . 如图,轮船A和轮船B同时离开海港匀速直线航行,其中轮船A的航行速度是v(nmile/h),轮船B的航行速度比轮船A快10(nmile/h).已知航行lh后,测得两船之间的距离为(v+20)nmile,如果两艘轮船的航行方向之间的夹角为钝角,则v的取值范围是_____ .
![](https://img.xkw.com/dksih/QBM/2020/7/27/2515093764349952/2515192930066432/STEM/b24a0f20-9490-4ffb-ac65-e3bf9b631f47.png)
您最近一年使用:0次
2020-07-27更新
|
427次组卷
|
3卷引用:四川省绵阳市2019-2020学年高一(下)期末数学试题
四川省绵阳市2019-2020学年高一(下)期末数学试题四川省绵阳市2019-2020学年高一下学期期末教学质量测试数学试题(已下线)6.4.3 正余弦定理的实际运用(精讲)-2020-2021学年高一数学一隅三反系列(人教A版2019必修第二册)
解题方法
5 . 如图,某市拟在长为
的道路
的一侧修建一条运动赛道,赛道的前一部分为曲线段
,该曲线段为函数
,
的图象;赛道的后一部分为折线段
,若
的内角
,
,
的对边分别为
,
,
.且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/76a5279d-95cb-4006-9895-7472fd8df6f3.png?resizew=281)
(1)求角
和
,
两点间的距离
的值;
(2)求折线段赛道
的长
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90eee1ed6e52706ac4dbcf2afa4c3555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33d448baf32fedefa95ee134fe78f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86b9f8461201b496de4710c1abc438f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc868a2077000982bd4594d95cfc351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7a9c97739393de8b51d66355594cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/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/882c4b02abccf9d4aa24bc2a20ef9d82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/76a5279d-95cb-4006-9895-7472fd8df6f3.png?resizew=281)
(1)求角
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)求折线段赛道
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7a9c97739393de8b51d66355594cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1810555c0c28fe352841322b85bbc6.png)
您最近一年使用:0次
名校
6 . 2020年5月,我海军第35批护航编队,在亚丁湾海域开始执行护航任务,某日,护航编队旗舰“太原”舰,在
处收到某商船在航行中发出求救信号后,立即测出该商船在方位角(是从某点的指北方向线起,依顺时针方向到目标方向线之间的水平夹角)为45°、距离
处为
的
处,并测得该船正沿方位角为105°的方向,以
的速度航行,“太原”舰立即以
的速度航行前去营救.
(1)“太原”舰最少需要多少小时才能靠近商船?
(2)在营救时间最少的前提下,“太原”舰应按照怎样的航行方向前进?
(角度精确到0.1°,参考数据:
,
,
)
![](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/ffc3cc238d99a87df97391d008b6e196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bfa6c32a4eee4195ddb1d7531d481d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de38f3b91add925d336dd0e8e69ba6e0.png)
(1)“太原”舰最少需要多少小时才能靠近商船?
(2)在营救时间最少的前提下,“太原”舰应按照怎样的航行方向前进?
(角度精确到0.1°,参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb160075701398eeeee687162323f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95042fa5ccc55462334c77fdab835e8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
您最近一年使用:0次
2020-07-22更新
|
166次组卷
|
5卷引用:人教A版 全能练习 正余弦定理 章节能力测评(二 )
解题方法
7 . 已知四面体
中,棱
,
所在直线所成角为
,且
,
,
,面
和面
所成的锐二面角为
,面
和面
所成的锐二面角为
,当四面体
的体积取得最大值时( ).
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37aca8efdc37f16d3aa267ab0b5885b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa18c2a78c400c80a5760743f31771c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecfe1bf6f7bfe17f9bd28e97b0147f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb49d869110f27140f5c1934143db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.![]() | B.![]() | C.![]() | D.不能确定 |
您最近一年使用:0次
8 . 如图,港口A在港口O的正东100海里处,在北偏东方向有条直线航道OD,航道和正东方向之间有一片以B为圆心,半径为
海里的圆形暗礁群(在这片海域行船有触礁危险),其中OB=
海里,tan∠AOB=
,cos∠AOD=
,现一艘科考船以
海里/小时的速度从O出发沿OD方向行驶,经过2个小时后,一艘快艇以50海里/小时的速度准备从港口A出发,并沿直线方向行驶与科考船恰好相遇.
![](https://img.xkw.com/dksih/QBM/2020/6/4/2476974523432960/2478234643357696/STEM/a8aee52d-2c88-43f6-bb56-f991d1be7524.png?resizew=243)
(1)若快艇立即出发,判断快艇是否有触礁的危险,并说明理由;
(2)在无触礁危险的情况下,若快艇再等x小时出发,求x的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a46fd58e40935064129c4676ec310791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/992dd866aa5e3a53518a872b034306bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d1137bd3216389e0ebc81f6cef8b947.png)
![](https://img.xkw.com/dksih/QBM/2020/6/4/2476974523432960/2478234643357696/STEM/a8aee52d-2c88-43f6-bb56-f991d1be7524.png?resizew=243)
(1)若快艇立即出发,判断快艇是否有触礁的危险,并说明理由;
(2)在无触礁危险的情况下,若快艇再等x小时出发,求x的最小值.
您最近一年使用:0次
名校
9 . 在120°的二面角内有一点
,
到二面角的两个半平面的距离分别为1米和3米,则
到该二面角棱的距离为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
2020-06-04更新
|
323次组卷
|
2卷引用:上海市七宝中学2019-2020学年高二下学期期中数学试题
解题方法
10 . 如图,某大型厂区有三个值班室
,值班室
在值班室
的正北方向
千米处,值班室
在值班室
的正东方向
千米处.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/8b565dc1-55ce-403a-9334-42df0501f31f.png?resizew=180)
(1)保安甲沿
从值班室
出发行至点
处,此时
,求
的距离;
(2)保安甲沿
从值班室
出发前往值班室
,保安乙沿
从值班室
出发前往值班室
,甲乙同时出发,甲的速度为
千米/小时,乙的速度为
千米/小时,若甲乙两人通过对讲机联系,对讲机在厂区内的最大通话距离为
千米(含
千米),试问有多长时间两人不能通话?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.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/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/8b565dc1-55ce-403a-9334-42df0501f31f.png?resizew=180)
(1)保安甲沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)保安甲沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
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2020-05-16更新
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320次组卷
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4卷引用:沪教版(2020) 一轮复习 堂堂清 第三单元 3.5 正弦定理,余弦定理(一)
沪教版(2020) 一轮复习 堂堂清 第三单元 3.5 正弦定理,余弦定理(一)2020届江苏省南京师大附中、淮阴中学、姜堰中学、海门中学四校高三下学期4月联考数学试题江苏省2020届高三下学期6月高考押题数学试题(已下线)预测05 三角函数与解三角形-【临门一脚】2020年高考数学三轮冲刺过关(江苏专用)