题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053006-21865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053006-34803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-17765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-26552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-22238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-44966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-79633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053008-51892.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053008-57682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-26552.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053008-70187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053008-69917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-17765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-51134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-18070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-84543.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-23040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-84634.png)
解析
试题分析:(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-44966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-79633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053008-51892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-85889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-30096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-18070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-13080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-98572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-30777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-78801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-70395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-17159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-32559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-52061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-41238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-32628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-14281.png)
把以上
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-17765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-84959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-23040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-44493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053014-39085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053014-92725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053014-61045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053014-51323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053015-37692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053015-40679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-84543.png)
试题解析:(1)依题意:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053010-85889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053015-93216.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053015-85375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053015-10867.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-18070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053016-63133.png)
②代入①并整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-14281.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-78801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053011-70395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-17159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-32559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-52061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053012-41238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-32628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-14281.png)
把以上
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-17765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053013-84959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053006-34803.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053016-36509.png)
∵当
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053016-18937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053006-34803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053016-36509.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053016-47677.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053017-49549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053017-93571.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053017-33566.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053017-69646.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-18070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053018-28056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053018-36647.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053018-68218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053018-48834.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053009-84543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053007-17765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009053019-15448.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052953-71694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052953-98617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052954-14651.png)
A.8 | B.12 | C.16 | D.24 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052940-59192.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052940-32627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052940-35828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052940-87594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-19790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-19159.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052940-59192.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-21673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-70019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-51774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052942-41411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052942-41411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052941-51774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052836-47800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052837-99619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052837-34499.png)
A.24 | B.48 | C.96 | D.无法确定 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052722-74129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052722-15148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052722-61223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-22404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-42966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-39830.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-61127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-75139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-61127.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052723-72308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052724-24913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052553-93568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052553-38749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052553-19226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052554-58528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052554-36541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009052554-35145.png)
A.153 | B.182 | C.242 | D.273 |
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