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解题方法
1 . 如图,某沿海地区计划铺设一条电缆联通
两地,
处位于东西方向的直线
上的陆地处,
处位于海上一个灯塔处,在
处用测角器测得
,在
处正西方向
的点
处,用测角器测得
.现有两种铺设方案:
①沿线段
在水下铺设;
②在岸
上选一点
,设
,先沿线段
在地下铺设,再沿线段
在水下铺设.已知地下、水下的电缆铺设费用分别为2万元
、4万元
.
两点间的距离;
(2)请选择一种铺设费用较低的方案,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3414b52b5656d826bde86cf7da8b1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1890f0b4e81634bb7e013412698640f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb06a2fc3b4f20a3613fbb10a5279952.png)
①沿线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
②在岸
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e82bf62b0b7ab38ca71d4257804474f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98024ce2e23a5e81b2bcdd7c96ccef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98024ce2e23a5e81b2bcdd7c96ccef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
(2)请选择一种铺设费用较低的方案,并说明理由.
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2 . 如图所示,一艘海轮在海面上的
处发现两座小岛
,
,测得小岛
在
的北偏东
的方向上,小岛
在
的北偏东
的方向上,海轮从
处向正东方向航行100海里后到达
处,测得小岛
在
的北偏西
的方向上,小岛
在
的北偏东
的方向上.
处与小岛
之间的距离;
(2)求
,
两座小岛之间的距离.
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.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/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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3 . 如图,
三地在以
为圆心的圆形区域边界上,
公里,
公里,
,
是圆形区域外一景点,
,
.
的长(精确到小数点后两位);
(2)若一汽车从
处出发,以每小时50公里的速度沿公路
行驶到
处,需要多少小时?(精确到小数点后两位)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f325403cbedaac249c9a78d33da81a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382799128fa8b3180f157774f4b3d62b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a5a016e426f1bba32ed45db7b96779.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecb4aa59baf1fbbde44df7a68059ec2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)若一汽车从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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解题方法
4 . 如下图所示,某市郊外景区内一条笔直的公路经过三个景点
、
、
.景区管委会又开发了风景优美的景点
.经测量景点
位于景点
的北偏东
方向
处,位于景点
的正北方向,还位于景点
的北偏西
方向上.已知
.
(1)景区管委会准备由景点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47bb3f35e3db7c1f3a3dd3eb20151b5f.png)
您最近一年使用:0次
2023-11-12更新
|
683次组卷
|
6卷引用:上海市控江中学2024届高三上学期期中数学试题
上海市控江中学2024届高三上学期期中数学试题6.4.3.3余弦定理、正弦定理应用举例练习(已下线)专题13 余弦定理、正弦定理的应用-【寒假自学课】(苏教版2019)(已下线)专题6.8 解三角形的综合应用大题专项训练-举一反三系列(已下线)第六章 平面向量及其应用(知识归纳+题型突破)2-单元速记·巧练(人教A版2019必修第二册)(已下线)第11章 解三角形 单元综合检测(重点)-《重难点题型·高分突破》(苏教版2019必修第二册)
5 . 如图,我边防巡逻艇在
处测得,北偏东
相距10海里的
处,有一艘可疑船只正以每小时12海里的航速沿东南方向驶去.上级指示我艇:匀速航行半小时,在
处准时追上目标.
(1)求我边防巡逻艇的航速;
(2)求我边防巡逻艇的航向角(即
的大小,精确到
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/7/2cd51612-0292-4962-8ca8-feb13a40ef5a.png?resizew=174)
(1)求我边防巡逻艇的航速;
(2)求我边防巡逻艇的航向角(即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8fd11eb555e1e64a6bac8afe59a557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6677e08dfc8e9c0bef8edeb27bc1b1.png)
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6 . 某科学考察队在某地考察时,在距离
点20千米处的西侧、东侧分别设立了站点
、
.现以
为坐标系原点,
的东侧为
轴正方向,
的北侧为
轴正方向建立平面直角坐标系.
(1)若考察发现一点
满足
(千米),据此写出
所在的曲线方程;若进一步观察到,
在
的北偏东
方向处,求
点的坐标;
(2)若考察发现一点
满足
(千米).为进一步得到
位置,该考察队在距离
点15千米处的南侧、北侧分别设立了站点
、
,且
(千米),求
的距离(精确到1米)和点
相对于
的方向(精确到
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)若考察发现一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63706d833c1b4b4173f5bb53feb31c84.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若考察发现一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03d5ad149905e01e6d7fe38216936c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57de927f4e5a824584d43ab8fb9ff6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a840804ee07144f46c9c2a33e33ae450.png)
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7 . 某校学生利用解三角形有关知识进行数学实践活动.
处有一栋大楼,某学生选(与
在同一水平面的)
、
两处作为测量点,测得
的距离为
,
,
,在
处测得大楼楼顶
的仰角
为
.
(1)求
两点间的距离;
(2)求大楼的高度.(第(2)问不计测量仪的高度,计算结果精确到
)
![](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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c56c87fd6bf8a44244ba51a9d244e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c284ccb6f4ee7a8690013d2ce16e226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0ec7f8ab857cd441a82389b246230a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/30/30ca0028-ebd7-4434-9e91-d70d077fee39.png?resizew=190)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
(2)求大楼的高度.(第(2)问不计测量仪的高度,计算结果精确到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6563eb699f1bbc39eced661a2ebfcce4.png)
您最近一年使用:0次
8 . 如图,甲船在距离A 港口24海里并在南偏西20°方向的C 处驻留等候进港,乙船在 A 港口南偏东40°方向的B 处沿直线行驶入港,甲、乙两船距离为31海里.
(2)当乙船行驶20海里到达D 处时,接到港口指令,前往救援忽然发生火灾的甲船,求此时甲乙两船之间的距离.
(2)当乙船行驶20海里到达D 处时,接到港口指令,前往救援忽然发生火灾的甲船,求此时甲乙两船之间的距离.
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2023-04-21更新
|
1133次组卷
|
6卷引用:上海市浦东新区2022-2023学年高一下学期期中数学试题
上海市浦东新区2022-2023学年高一下学期期中数学试题(已下线)6.3 解三角形-高一数学同步精品课堂(沪教版2020必修第二册)广东省惠州市博罗县杨侨中学2022-2023学年高一下学期5月月考数学试题6.4.3.3余弦定理、正弦定理应用举例练习(已下线)6.4.3 第3课时 余弦定理、正弦定理应用举例【第一练】“上好三节课,做好三套题“高中数学素养晋级之路(已下线)9.2正弦定理与余弦定理的应用-同步精品课堂(人教B版2019必修第四册)
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9 . 2023年的春节,人们积蓄已久的出行热情似乎在这一刻被引爆,让旅游业终于迎来真正意义上的“触底反弹”.如图是某旅游景区中的网红景点的路线图,景点A处下山至
处有两种路径:一种是从A沿直线步行到
,另一种是先从A沿索道乘缆车到B,然后从B 沿直线步行到
.现有甲、乙两位游客从A处下山,甲沿
匀速步行,速度为
.在甲出发
后,乙从A乘缆车到B ,在B 处停留
后,再从B 匀速步行到
.假设缆车匀速直线运行的速度为
,索道
长为
,经测量,
.
的长;
(2)乙出发多少分钟后,乙在缆车上与甲的距离最短?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20fa315234c42ac12a1de359c1f98a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db9ef98b758ca2e2ee0f682dca323848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17166d730bec1b4ee345727b42265ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ed98bbd61c59726cf5e96bec173b66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50073d90fe64d49ac2c16047266f64c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fe43f68cd6f2851673b69f0fc0e243b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)乙出发多少分钟后,乙在缆车上与甲的距离最短?
您最近一年使用:0次
2023-04-20更新
|
529次组卷
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8卷引用:上海市松江区第四中学2023-2024学年高三上学期期中学情诊断数学试题
名校
解题方法
10 . 如图所示是某斜拉式大桥图片,为了解桥的一些结构情况,学校数学兴趣小组将大桥的结构进行了简化,取其部分可抽象成图(1)所示的模型,其中桥塔
与桥面
垂直,通过测量得知
,当
为
中点时,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/8eb65219-6da9-485d-9251-edfc6794b1eb.png?resizew=383)
(1)求
的长;
(2)设
,写出
与
的函数关系式;
(3)已知命题:函数
在
内为严格增函数;求证该命题为真命题,并用该命题求解
在线段
的何处时,
达到最大,最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947a9e717f8bd9e2f5eb3ba8929932a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4a3caf9045a08a8342c73496c4274cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1d0963bbe4d4d8eda2210585fc1d7d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/1/8eb65219-6da9-485d-9251-edfc6794b1eb.png?resizew=383)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd459a6de5d294b1dfb95e596793f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)已知命题:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a869a76555f3369728f9005863bdb8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4138f6987cd2ee9e56b2ac80e84f9e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
您最近一年使用:0次
2023-03-30更新
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621次组卷
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3卷引用:上海市奉贤中学2022-2023学年高一下学期期中数学试题
上海市奉贤中学2022-2023学年高一下学期期中数学试题上海市金山中学2022-2023学年高一下学期3月素养检测(一)数学试题(已下线)专题12 寒假成果评价卷 -【寒假自学课】(沪教版2020)