1 . 如图,在长方形
中,
,
,
为线段
上一动点,现将
沿
折起,使点
在面
上的射影
在直线
上,当
从
运动到
,则
所形成轨迹的长度为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/2012/2/4/1570714515013632/1570714520354816/STEM/0e41bf69af00418d83b24a05db8bf5fa.png?resizew=313)
您最近一年使用:0次
11-12高三·甘肃天水·阶段练习
解题方法
2 . 已知向量
,向量
,则
的最大值__________ .
![](https://img.xkw.com/dksih/QBM/2013/7/1/1571260297281536/1571260302401536/STEM/ca93a5192a60452bbd0ae96d30b7a3e7.png?resizew=109)
![](https://img.xkw.com/dksih/QBM/2013/7/1/1571260297281536/1571260302401536/STEM/22fca4b3c01448a897ddd970497d063d.png?resizew=80)
![](https://img.xkw.com/dksih/QBM/2013/7/1/1571260297281536/1571260302401536/STEM/d1c5b4ef1d224ad6be0232743effb1b8.png?resizew=56)
您最近一年使用:0次
10-11高一·河北·单元测试
解题方法
3 . 若集合
,
,则
=______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ab8958f911f416f719a0799bf3ff2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c68fb5ac20721d01eb97bd160b40b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
您最近一年使用:0次
10-11高三·江西上饶·阶段练习
名校
4 . 已知不重合的直线
和平面
,
,
,则“
”是“
”的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1c8146d084248c9c65dd8a11801905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc16033924a8f670374b9d1563b81d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d09984d3432edd59564096536e7ac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b7a25f37563ba5fe47b4cf90326317.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e91e7a3b0e2708782def67d197589b9.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2016-11-30更新
|
2240次组卷
|
9卷引用:浙江省金华市东阳市外国语学校、东阳中学2022-2023学年高一下学期5月联考数学试题
浙江省金华市东阳市外国语学校、东阳中学2022-2023学年高一下学期5月联考数学试题(已下线)2011届江西省上饶市四校高三第二次联考数学文卷高一数学人教A版(2019) 必修第二册 第八章 立体几何 单元测试河南省郑州市新密市矿区中学2022-2023学年高一下学期5月月考数学试题(已下线)江西省上饶市四校2011届高三第二次联考数学(文科)试题卷2020届辽宁省锦州市渤大附中、育明高中高三下学期开学摸底考试数学(文)试题(已下线)第8章 立体几何初步(单元提升卷)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)(已下线)第8章 立体几何初步(单元测试)-【上好课】2022-2023学年高一数学同步备课系列(人教A版2019必修第二册)安徽省芜湖市安徽师大附中2023-2024学年高二下学期3月测试数学试题
10-11高三上·广东·期中
名校
5 . 设数列
的通项公式为
.数列
定义如下:对于正整数
是使得不等式
成立的所有
中的最小值.
(1)若
,
,求
;
(2)若
,
,求数列
的前
项和公式;
(3)是否存在
和
,使得
?如果存在,求
和
的取值范围;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e2294cf1ed89c6edfb0d4897ef8087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3a0edce7c30258f1d134ca2d08a64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a4edad0dfcd1d7f4225d15c305d1587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63cad0f23354aa754ade482d849557fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f970f380a12c843bb4a74ff34a15b2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b331f0c2ad289ef8161b7e59264a75a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acff98078cdd32804d8f1c4efbe2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4998bb3fc2c3c9bd277611d86d71578b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c320a0619c63a5b650a1a94c0a5679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
(3)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a908e102552ad10f2e528b817549378.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
您最近一年使用:0次
2016-11-30更新
|
1297次组卷
|
6卷引用:浙江省余姚中学2017-2018学年高一4月质量检测数学试题