1 . 已知
,设不等式组
所表示的平面区域为
,记
内整点的个数为
(横、纵坐标均为整数的点称为整点).
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340591632384/1572340597243904/STEM/d41a0022592f4456bcdca92b8fc985d0.png?resizew=291)
(1)通过研究
的值的规律,求
的通项公式;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640158fc8aa8a64eec915329fe799a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://img.xkw.com/dksih/QBM/2015/12/3/1572340591632384/1572340597243904/STEM/d41a0022592f4456bcdca92b8fc985d0.png?resizew=291)
(1)通过研究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c14d9ae06f864498048d55088ff4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a3f7be59e028431dca09fbc2510cc95.png)
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2 . 设点
,其中
,满足
的点
的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee82283f06cedef32eb15b87964f5d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3276ada68f77f0557412aff89000f34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d900496d940a825546e3b5c8f879b262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.10 | B.9 | C.3 | D.无数个 |
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2017-11-27更新
|
252次组卷
|
3卷引用:安徽省阜阳市太和中学2017-2018学年高二上学期期中考试数学(理)试题
名校
3 .
可以表示为数轴上1右边的点
(1)
可以在平面直角坐标系中表示为__________;
(2)在坐标系中用阴影表示满足
的点;
(3)
与上述阴影部分围成的封闭图形(不含边界)中包含2个整点(横纵坐标均为整数的点)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecedde061163f1e524308688204e9ef9.png)
(2)在坐标系中用阴影表示满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1be1f7713bf93673b52fef8d8cae01.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ebce8b2a915356ed39f36c5bad2ebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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4 . 设不等式组
所表示的平面区域为
,记
内的格点(格点即横坐标和纵坐标均为整数的点)的个数为
.
(1)求
、
的值及
的表达式;
(2)设
,
为
的前
项和,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ab25cf1944f1e16c1d0bd188865091.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4520946f7a3c5948bbdffb30ebb7c920.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce6155e181e21ce56ea658b70f8af17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d55ef0d1b7ea88d92fd6e1ecebb5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88f70b27d17917d955ac9d0b7eca56d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
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5 . 某小学教师准备购买一些签字笔和铅笔盒作为奖品,已知签字笔每支5元,铅笔盒每个6元,花费总额不能超过50元. 为了便于学生选择,购买签字笔和铅笔盒的个数均不能少于3个,那么该教师有_______ 种不同的购买奖品方案.
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2016-12-03更新
|
512次组卷
|
2卷引用:2015届北京市西城区高三上学期期末考试文科数学试卷
名校
6 . 某学生计划用不超过50元钱购买单价分别为6元、7元的软皮和硬皮两种笔记本,根据需要软皮笔记本至少买3本,硬皮笔记本至少买2本,则不同的选购方式共有__________ 种.
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2017-10-02更新
|
236次组卷
|
2卷引用:河南省中原名校2018届高三上学期第一次质量考评+数学(理)
7 . 设不等式组
所表示的平面区域为
,记
内的格点(格点即横坐标和纵坐标均为整数的点)个数为
.
(1)求
的值及
的表达式;
(2)记数列
的前
项和为
,若
对任意正整数
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feeafec53e501804ecbad79886b915f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4979097b84b710323942b80d35eb25a8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d05612c6a6463106df18abea1d0c2489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
(2)记数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b35eadc34855de68a104aa47ed9e624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d11a0b058d0fd6d626966f499aa1247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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2017-02-16更新
|
636次组卷
|
2卷引用:2016-2017学年江西吉安一中高二理上学期段考二数学试卷
8 . 在平面直角坐标系xOy中,如果菱形OABC的边长为2,点B在y轴上,则菱形内(不含边界)的整点(横纵坐标都是整数的点)个数的取值集合是
A.{1,3} | B.{0,1,3} |
C.{0,1,3,4} | D.{0,1,2,3,4} |
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