解题方法
1 . 已知函数
,设数列
的通项公式为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb58b4b4d1f8db0aa7f515141c50eea0.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf459942f6b4f7a7ed5da6a93986c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd282baf4a8e5a74bcfdd91c3396b01b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb58b4b4d1f8db0aa7f515141c50eea0.png)
您最近一年使用:0次
名校
2 . 设函数
,
.
(1)若
,当
时,
单调递增,求a的取值范围;
(2)若
是
的一个极大值点.
(i)当
,求b的取值范围;
(ii)当a是给定的实常数,设
,
,
是
的3个极值点,问是否存在实数b,可找到
,使得
,
,
,
的某种排列
,
,
,
(其中{
,
,
,
}={1,2,3,4}依次成等差数列?若存在,求所有的b及相应的
;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5276a5529d1465204e0441d39548ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(i)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
(ii)当a是给定的实常数,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c41e90dcab6783fff43f03390ef298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99e5ee0eaeb1b74999cc0a9a9f244545.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f208cee1885a263ae371c7d46189b59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388563dca8b69e2a6692002db3d37670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2a0e1fa9705b6a52072bbb69eac386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5f59bc23cf55f56312c9ed9806371f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6af9e7b1c23db5584ad8521d4444d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef259280a3e7fc0425fc9d6d7c5b8484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fde28a4345a8add444647ffebc46bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
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3 . 已知
是等差数列,满足
,则该数列前8项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a71a39649f8e5fdd35903afd499584.png)
A.36 | B.24 | C.16 | D.12 |
您最近一年使用:0次
2021-04-01更新
|
1310次组卷
|
2卷引用:陕西省宝鸡市2021届高三下学期高考模拟检测(二)文科数学试题
4 . 我国古代的《洛书》中记载着世界上最古老的一个幻方:如图,将
填入
的方格内,使三行,三列和两条对角线上的三个数字之和都等于
.一般地,将连续的正整数
填入
个方格中,使得每行,每列和两条对角线上的数字之和都相等,这个正方形叫做
阶幻方记
阶幻方的对角线上的数字之和为
,如图三阶幻方的
,那么
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/391a9f79-a370-40a5-9024-54a4d1d1e478.png?resizew=158)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a073b20c885f0b64286c6441a181b8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/777d8fccf0cf8b55a68488fe48b78744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b184c94e38f1e5dbe750b2168c2a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92ffc57987e8ce6bd4e034d3fa0d8b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/767f5a4746f04db68386fac3970b1ed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ae0b861522b18be1753acc4474cbc9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea30e7a3f7c68487d8bb224909b9455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d6a5482f70366bced2a71ea1ed39192.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b72393aeb59f57a6ea18ed946a2f0d3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/391a9f79-a370-40a5-9024-54a4d1d1e478.png?resizew=158)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 已知数列
为等差数列.
(1)求证:
;
(2)设
,且其前
项和
,
的前
项和为
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63c3b8cbcaf01ba4aff344d8fd9c9c6.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677e46ecd051c92489c0d1d458932f37.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/8050391385b496e9c059201e4f12600a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c3fec47d2dd2b8099d86c87b6e57de8.png)
您最近一年使用:0次
2019-12-27更新
|
853次组卷
|
5卷引用:陕西省安康市2019-2020学年高三上学期12月阶段性考试理科数学试题
陕西省安康市2019-2020学年高三上学期12月阶段性考试理科数学试题(已下线)专题07 数列与不等式相结合问题(第二篇)-备战2020年高考数学大题精做之解答题题型全覆盖(已下线)数学-2020年高考数学押题预测卷02(江苏卷)《2020年高考押题预测卷》普通高等学校招生国统一考试 2020-2021学年高三上学期数学(理)考向卷(六)普通高等学校招生国统一考试2020-2021学年高三上学期 数学(文)考向卷(六)