1 . 从1,2,3,…,2050这2050个数中任取2018个组成集合
,把
中的每个数染上红色或蓝色,求证:总存在一种染色方法,使得有600个红数及600个蓝数满足下列两个条件:
①这600个红数的和等于600个蓝数的和;
②这600个红数的平方和等于这600个蓝数的平方和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
①这600个红数的和等于600个蓝数的和;
②这600个红数的平方和等于这600个蓝数的平方和.
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2 . 如图,在圆内接四边形
中,对角线
与
交于点
,
与
的内心分别为
和
,直线
分别与
,
交于点
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f1ac49b4139636fb1809fe970b23a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1a0fd1ad044a9ecfcba672779bd678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956ae91848bdbc3399740b3fc64bd5ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4acd79bb9fb06f7c806eb6e17e4b613.png)
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093628058075136/2093895108444160/STEM/204df4ca8d994ca99712a117ea932f39.png?resizew=187)
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3 . 如图,在平面直角坐标系
中,已知圆
的方程为
,过点
的直线
与圆
交于点
,
,与
轴交于点
,设
,
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333160ac2088b2f83ac1e0c446b5d8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](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/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcd74b57b04f76f9c5b1829c96972e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d2c87b6b88c05b49d195d17307739d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febf7413b35cf2889fdb57a6b519087c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/974aa845-ff37-4039-85c8-b921d0e76f15.png?resizew=161)
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2018-12-10更新
|
315次组卷
|
3卷引用:2018江苏高联初赛试题
4 . 已知
是公差为
的等差数列,且
.
(1)求实数
,
的值;
(2)若正整数满足
,
,求数组
和相应的通项公式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504c515e77e919aa8b1f54d392cb0298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e813b670dbc7044534c70961c93faf.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(2)若正整数满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b9c5ace37d53f2b1ec8c2a6a3d7bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1049f55f007f0bd923c36935622ee847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b49e54432375916b1fe7280189f4abfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
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5 . 将1,2,3,4,5,6,7,8,9这9个数随机填入
的方格表中,每个小方格恰填写一个数,且所填数各不相同,则使每行、每列所填数之和都是奇数的概率是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e329a94337ada7c88a4fad9b92f0eb.png)
![](https://img.xkw.com/dksih/QBM/2018/12/10/2093628058075136/null/STEM/50ff08a0a99c4080984539a19bc884e3.png?resizew=190)
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6 . 在1,2,3,4,…,1000中,能写成
的形式,且不能被3整除的数有________ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848c0e742239ba7363cd8f09191167cd.png)
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7 . 设
,其中
,
表示
与
的最大公约数,则
的值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33980af539059ad542c3fee30e6b5198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5cf9c12181dd8683944b2b30bf8e08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6b84bc1f74d29a958e673d256230b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab9034e8a39995aba8d29e6632e60d9.png)
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8 . 在
中,
,
,且
,设
为平面
上的一点,则
的最小值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87260baee4cb873d3f2aa3d3aeac207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0f3fc2d5508c1797a1adbe762032aa.png)
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9 . 已知正四面体内切球的半径是1,则该正四面体的体积为________ .
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10 . 已知等差数列
的前12项的和为
,则
的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b3779b4ea5477aebfe85113b0de1d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a39e4749c77d443c4ee4c3195e57da.png)
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