1 . 如图所示,将两块全等的直角三角形纸片
和
叠放在一起,其中
,顶点
与边
的中点重合,
交
于点
交
于点
,则重叠部分
的面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7701500ced847d09941996082f7b6737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d5d41f8b8fc5ae91bd53368c4ebe51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f660f3d677ecd3cbf5c63e82690357ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/31/6ee960e7-284c-4d5e-85cf-dcbbdf179f0e.png?resizew=160)
您最近一年使用:0次
2024-04-03更新
|
55次组卷
|
2卷引用:河南省南阳市西峡县第一高级中学2023-2024学年高二下学期第一次月考数学试卷
名校
解题方法
2 . 在三棱锥
中,
,
,
,
分别是
,
,
,
的重心.则下列命题中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() ![]() | B.![]() |
C.四条直线![]() ![]() ![]() ![]() | D.![]() |
您最近一年使用:0次
2023-03-25更新
|
834次组卷
|
2卷引用:河南省信阳市信阳高级中学2022-2023学年高二下学期6月月考数学试题
名校
3 . 2022年冬奥会在北京举办.现有如图所示“2022•北京冬梦之约”的四枚邮票供小明选择,依次记为A,B,C,D,背面完全相同.将这四枚邮票背面朝上,洗匀放好
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/acc8fb31-076a-47bf-a098-413b0e58d149.png?resizew=451)
(1)小明从中随机抽取一枚,恰好抽到是B(冰墩墩)概率是_________(直接写出结果)
(2)小颖从中随机抽取一枚不放回,再从中随机抽取一枚.请用列表或画树状图的方法,求小颖同学抽到的两枚邮票恰好是B(冰墩墩)和C(雪容融)的概率.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/acc8fb31-076a-47bf-a098-413b0e58d149.png?resizew=451)
(1)小明从中随机抽取一枚,恰好抽到是B(冰墩墩)概率是_________(直接写出结果)
(2)小颖从中随机抽取一枚不放回,再从中随机抽取一枚.请用列表或画树状图的方法,求小颖同学抽到的两枚邮票恰好是B(冰墩墩)和C(雪容融)的概率.
您最近一年使用:0次
2023-01-18更新
|
69次组卷
|
2卷引用:陕西省西安市第三中学2022-2023学年高二下学期期中理科数学试题
名校
4 . “中山桥”是位于兰州市中心,横跨黄河之上的一座百年老桥,如图①,桥上有五个拱形桥架紧密相连,每个桥架的内部有一个水平横梁和八个与横梁垂直的立柱,气势宏伟,素有“天下黄河第一桥”之称.如图②,一个拱形桥架可以近似看作是由等腰梯形
和其上方的抛物线
(部分)组成,建立如图所示的平面直角坐标系,已知
,
,
,
,立柱
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e505e7a8-da19-471b-b677-e09d1a77f214.png?resizew=435)
(1)求立柱
及横梁
的长;
(2)求抛物线
的方程和桥梁的拱高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/773b35fa01ca1f4ba5629a3c48eb262a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20eabf2c45e7b8fcba8ba233c42aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97146a43d46c9705c59401820716db8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd904876923401de4b5197bf5de17bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663fd6488af95494bf9adb4da41e2d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c337e2cb615f13f1a6fbb44cf519f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/e505e7a8-da19-471b-b677-e09d1a77f214.png?resizew=435)
(1)求立柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
(2)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf20eabf2c45e7b8fcba8ba233c42aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
您最近一年使用:0次
2022-01-28更新
|
243次组卷
|
2卷引用:陕西省宝鸡市金台区2021-2022学年高二上学期期末理科数学试题
名校
5 .
,定义运算:
,
,则下列判断正确的是________ (填序号即可)
①
;
②
;
③
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360ff131c51a4ef6745538c18cec92c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41824f81bedb524b5e5e8b63fba662be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925b2e9c15dd9b0c5cccbe5f71e04413.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdde9d323a6975cd3d33ba2b5cbc80f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4482003971ff2fb4c6485300168608e3.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35647c80b1cf34c89d1f7998ec08df5.png)
您最近一年使用:0次