解题方法
1 . 在
中,内角A,B,C的对边分别为a,b,c,且
.
(1)证明:
;
(2)记
的面积为S,点P是
内一点,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a57f313b5cc528acf1bb6a19a1fa034.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c7f62dcb663cabd3304615d16b39cd.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec15e5cb6d4dc2cf6ba0bedd87514448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbda03600aa7fcee5794b42e9f5e1f5c.png)
您最近一年使用:0次
2 . 在如图所示珊瑚群岛上取两点C,D,且A,B,C,D四点共面,测得
,
,
,
,则A,B两点间的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd8c8b7f52cb48a21fdcff3e837a123d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/454f93b9b0915c99eaa2c80dab2947a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a112790c7143f66a7f9183771c1b255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790f1102305914d73f40039311944e20.png)
![](https://img.xkw.com/dksih/QBM/2022/8/13/3043625615917056/3043858026242048/STEM/f520ecbf3bb04b7cb05f0e38c7f4e127.png?resizew=178)
您最近一年使用:0次
解题方法
3 . 在
中,
是边
的中点,若
,向量
在向量
上的投影向量为______ ,若点
为线段
上的动点,且满足
,则
的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da532e98a24d360aa3dca8c9b0bf43ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305d5f36a9fdbc840161b36563923195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d792a2aa25763e14cc2863be3887000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffefa3b59247c7bce45b563dabdeda6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1adebff9fb726cd58eda1ef994890901.png)
您最近一年使用:0次
名校
4 . 先把一正六面体的六个面分别写上数字1到6,然后任意抛掷一次,把它与地面接触的面上的数字记为X,则
,定义事件:
,事件:
,事件:
,则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f40e1c27c0e94efddd6387aefdb7ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7460e531ad74fa01c12983c11d263cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fdd7e2d99b453240002929f38156f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca9e2873341176dee18f0ddc89f4be6.png)
A.![]() | B.![]() |
C.![]() | D.A,B,C两两相互独立 |
您最近一年使用:0次
2022-08-13更新
|
400次组卷
|
2卷引用:山东省临沂市兰山区2021-2022学年高二上学期开学考试数学试题
5 . 已知平面单位向量
,
,
满足
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b28baf17059c56ee9ad1ae4814acd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b04618e5b2db68f2de6ba68972c505c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/decd249634d157b89dd35ece5d3ceea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fddc3739965695ab2c930d76bc78f1f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5e3f5d8c205ebd3008beb7e26be0f27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281aa7e1dc2c4a9e43687c68dbbb2a8f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
6 . 在如图所示的半圆柱中,
为上底面直径,
为下底面直径,
为母线,点F在
上,点G在
上且
,P为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c8aca1e1-17db-4aa5-a9d5-ead2f30f44e5.png?resizew=164)
(1)求直线
与直线
所成角的余弦值;
(2)求直线
与平面
所成角的正切值;
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5db40c0ad940125cb88c967bb5a92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4fedfb207cfa9a417d5437494dd9ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/16/c8aca1e1-17db-4aa5-a9d5-ead2f30f44e5.png?resizew=164)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb58ca76c1fb28b4cb408bb9897b70a1.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0cc1f539db722b39ce1013eb52b7449.png)
您最近一年使用:0次
2022-08-13更新
|
440次组卷
|
2卷引用:山东省临沂市兰山区2021-2022学年高二上学期开学考试数学试题
名校
解题方法
7 . 如图,正方体
的棱长为2,M为棱
的中点,N为棱
上的点,且
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/52be63fe-5483-4d6f-85c3-15ecc4564b7a.png?resizew=137)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0d2e540560faa2b01817c9d85c7359.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/52be63fe-5483-4d6f-85c3-15ecc4564b7a.png?resizew=137)
A.当![]() ![]() ![]() |
B.当![]() ![]() |
C.当![]() ![]() ![]() |
D.对任意![]() ![]() ![]() |
您最近一年使用:0次
2022-08-13更新
|
1327次组卷
|
5卷引用:山东省临沂市兰山区2021-2022学年高二上学期开学考试数学试题
名校
解题方法
8 . 在
中,内角A,B,C的对边分别为a,b,c,
.
(1)求角A的值;
(2)若边
上的高为3,求a的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d627b54c3bb6a5e4f8a4cefab90a9ecd.png)
(1)求角A的值;
(2)若边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
2022-08-13更新
|
537次组卷
|
2卷引用:山东省临沂市兰山区2021-2022学年高二上学期开学考试数学试题
9 . 某中学高二各班三分钟跳绳比赛的成绩如下:257,311,267,301,279,296,246,287,257,323,266,293,304,269,332,270,则第75百分位数为______ .
您最近一年使用:0次
名校
10 . 为提高生产效率,某汽车零件加工厂的甲乙两个车间进行比赛,下表是对甲乙两个车间某天生产零件个数的统计,根据表中数据分析得出的结论正确的是( )
车间 | 参加人数 | 中位数 | 方差 | 平均数 |
甲 | 55 | 149 | 191 | 135 |
乙 | 55 | 151 | 110 | 135 |
A.甲、乙两车间这一天生产零件个数的平均数相同 |
B.甲车间这一天生产零件个数的波动比乙车间大 |
C.乙车间优秀的人数多于甲车间优秀的人数(这一天生产零件个数![]() |
D.甲车间这一天生产零件个数的众数小于乙车间零件个数的众数 |
您最近一年使用:0次
2022-08-13更新
|
157次组卷
|
3卷引用:山东省临沂市兰山区2021-2022学年高二上学期开学考试数学试题