题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-36485.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-24769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-24769.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-84215.gif)
(1)求a1,a2的值及数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-42602.gif)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-14402.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030610-80513.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030610-85026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030610-80513.gif)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030610-69287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030610-30064.gif)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030611-24416.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030611-85620.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030611-71191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030611-40505.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030611-43384.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-31028.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-31028.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-23829.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-81109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-65209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030612-28727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030613-48074.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030613-16654.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030609-42602.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030613-53581.gif)
(2)由(1)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030613-78663.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030614-63407.gif)
(3)由(1)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030614-62270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030614-68670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030614-59196.gif)
方法1:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030614-62397.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-44861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-53103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-33281.gif)
方法
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-71347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-67872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-17496.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-13950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-72275.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-88010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-88976.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-41562.gif)
综合
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-18075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-13393.gif)
再证左边
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030615-67872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-27183.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-13950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030618-79266.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030616-88010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030618-43899.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030618-60568.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030618-10295.gif)
综合
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-18075.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-13393.gif)
即当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030617-13393.gif)
核心考点
试题【设不等式组所表示的平面区域为,记内的整点(横坐标、纵坐标为整数的点)的个数是.(1)求a1,a2的值及数列的通项公式;(2)设,设为数列的前n项和,求;(3)设】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030553-28934.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030553-94852.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030553-54230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030554-74454.gif)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030554-87574.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030554-28264.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030553-28934.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030554-97207.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030548-34548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030548-34404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030548-73670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030548-44428.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030535-60294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030535-30862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030535-23332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030535-16117.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030535-89633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030536-96297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030536-52423.gif)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030536-64884.gif)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030536-49551.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030537-39390.gif)
(3)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030537-26333.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030530-38444.gif)
A.10 | B.11 | C.12 | D.13 |
在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030520-54271.gif)
(1)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030521-46529.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013030521-67119.gif)
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