名校
1 . 在平面直角坐标系
中,过
轴上一点
作两条直线
,
,其中
,
,
,
均在抛物线
:
上.已知
,
分别经过
轴上的点
,
,试比较
与
的大小,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34876d748f30fa4fc2eb6a686b5ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8953ded144195804384dcb494d5e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd185f841f1a65d36be61eabadc1228.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5206e025c703ef889c6d596f350d70f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722a6a702db7dcb53be644d6fd614e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cd946bffbd8d572c661f791a75c3bdd.png)
您最近一年使用:0次
名校
2 . 现有六人排成一列,每人在红,黄,蓝,白,黑五种颜色的球中选一个(每种颜色的球足够多).要求任意相邻两人所选的球或者同色,或者至少有一个为白色,则满足要求的选球方式数为______ .
您最近一年使用:0次
3 . 将顺序为1,2,…,2020的2020张卡片变成1011,1,1012,2,…,2020,1010的顺序,即原先的前1010张卡片移至第2,4,…,2020张,这称为一次操作.若从顺序1,2…,2020开始操作,则至少经过______ 次操作可以恢复到初始顺序.
您最近一年使用:0次
4 . 一条直线上有三个数字
,
,
,数字
位于
,
之间,称数值
为该直线的邻差值.现将数字1~9填入
的格子中,每个数字均出现,过横向三个格子、竖向三个格子及对角线三个格子共形成8条直线.则这8条直线的邻差值之和的最小值为______ ,最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1030fe85784473ae9070abc7bcfb6de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
您最近一年使用:0次
5 . 若
,
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2347c3b8239a5f8e66d5f585dee03cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f61d8c7d2c5193edf986a8e9377146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99074f989e74d5ff306b4b7b7a379c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd707b69a11f8de5566f23c1a2a9ff5a.png)
您最近一年使用:0次
6 . 已知素数
,
满足
.证明:存在正整数
使得
的十进制表示的各位数字之和是2或3.
![](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/8870a6a0826d38a5bc06174e163bb392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971d064c23be0e9d1a29d99c2f9746aa.png)
您最近一年使用:0次
7 . 某班有10名同学计划在暑假举行若干次聚会,要求每名同学至多参加三次聚会,并且任意两名同学至少在一次聚会中相遇.求最大的正整数
,使得无论如何安排符合上述要求的聚会,都一定存在某次聚会有至少
名同学参加.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
8 . 设
为正数,
为
的所有子集的任一个排列.求
的最大值,其中
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a84cb4d15071254b42985034c80cfea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ea993dd2879ecfefc8d2f312825662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36678342dee60262409ca8288ae2568d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29de0fa2c2a429768cf8e015f5758ca6.png)
您最近一年使用:0次
9 . 设m是一个给定的正整数,d是它的一个正因子.已知
和
是两个由正整数构成的等差数列,满足:存在正整数i、j、k、l,使得
.证明:存在正整数t、s使得
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afdb0e0f1040fa1b4fdc169f3a855dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765ece7f42a46a1c42c26b8099f641ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cb7bdf83a077daa48831de82ef6520b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f698007fbb9ddf038380bb08d38cf3.png)
您最近一年使用:0次
10 . 对每一个正整数
,求最大的常数
使得不等式
对任意满足
的实数
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59e7c7a84a4bdb959e95536d0404ceb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/397c638fab3e7359cf12359e9081d835.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d3a6e9d11ae7a8384e434de9add7aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
您最近一年使用:0次