名校
1 . 已知点
,(
为正整数)都在函数
的图象上.
(1)若数列
是等差数列,证明:数列
是等比数列;
(2)设
,过点
的直线与两坐标轴所围成的三角形面积为
,试求最小的实数
,使
对一切正整数
恒成立;
(3)对(2)中的数列
,对每个正整数
,在
与
之间插入
个3,得到一个新的数列
,设
是数列
的前
项和,试探究2016是否是数列
中的某一项,写出你探究得到的结论并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e348e118be23bda877bdab6d8d0c74d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996a92bcfc7fb20171fa1768d5ffddb2.png)
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abce20c3be7e20f84311ead7c51f06d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1377d208048d94845d6ec965536f9d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e99c2d597ddf409393ca51f838a0ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(3)对(2)中的数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f255d0395fba51ca2d44293cca42e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217b927efe12a98e1082ecd7f035b921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a57c08284ef994af246547f9b171d37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b783cf91e34e692ce8e171f0965cb53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846fa57d92d6ad44d6a0cafad1e71ed4.png)
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2019-12-05更新
|
227次组卷
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2卷引用:2016届上海市长宁区高三12月质量检测数学试题
17-18高一下·上海浦东新·期末
名校
2 . 如果一个数列从第2项起,每一项与它前一项的差都大于2,则称这个数列为“阿当数列”.
(1)若数列
为“阿当数列”,且
,
,
,求实数
的取值范围;
(2)是否存在首项为1的等差数列
为“阿当数列”,且其前
项和
满足
?若存在,请求出
的通项公式;若不存在,请说明理由.
(3)已知等比数列
的每一项均为正整数,且
为“阿当数列”,
,
,当数列
不是“阿当数列”时,试判断数列
是否为“阿当数列”,并说明理由.
(1)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f73a97d20f5bc6ce114cd7ae7845c009.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b1bfb98c2ca5473a25db8e422aa3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6df1038200f2d97a52c716aab6c3bcb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)是否存在首项为1的等差数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/771d258a9c027fca9daec87acf8c36cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16a90364bdffdb10175942d399cc895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/355979e22b1e14fb522ea7a9c885e237.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
您最近一年使用:0次
名校
3 . 已知数列
中,
,
,
.
(1)证明数列
是等比数列,并求数列
的通项公式;
(2)在数列
中,是否存在连续三项成等差数列?若存在,求出所有符合条件的项;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7bab423942f5e4d37c150ccfaf9f055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7695d7b6905ff9d4cd9b063028cc092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)在数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
您最近一年使用:0次
2019-11-14更新
|
695次组卷
|
4卷引用:上海奉贤区奉贤中学2018-2019学年高三上学期开学考试数学试题
4 . 某科技创新公司投资
万元研发了一款网络产品,产品上线第1个月的收入为40万元,预计在今后若干个月内,该产品每月的收入平均比上一月增长
,同时,该产品第1个月的维护费支出为
万元,以后每月的维护费支出平均比上一个月增加50万元.
(1)分别求出第6个月该产品的收入和维护费支出,并判断第6个月该产品的收入是否足够支付第6个月的维护费支出?
(2)从第几个月起,该产品的总收入首次超过总支出?(总支出包括维护费支出和研发投资支出)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21fc9b8069c873a9ccd378ee5abfaabd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d092ad3d5c017ed4c4bec0b5c3f31a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366d02f85d55ee1188ed6e19c0ce0b91.png)
(1)分别求出第6个月该产品的收入和维护费支出,并判断第6个月该产品的收入是否足够支付第6个月的维护费支出?
(2)从第几个月起,该产品的总收入首次超过总支出?(总支出包括维护费支出和研发投资支出)
您最近一年使用:0次
真题
名校
5 . 根据预测,某地第![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
个月共享单车的投放量和损失量分别为
和
(单位:辆),
其中
,
,第
个月底的共享单车的保有量是前
个月的
累计投放量与累计损失量的差.
(1)求该地区第4个月底的共享单车的保有量;
(2)已知该地共享单车停放点第
个月底的单车容纳量
(单位:辆). 设在某月底,共享单车保有量达到最大,问该保有量是否超出了此时停放点的单车容纳量?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391bd47f0e344b04b4e68dd49820ad00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e14b28110234e5a8c2c358a3fa9685e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f70754be0f92f25ac6adb8de66aaeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
累计投放量与累计损失量的差.
(1)求该地区第4个月底的共享单车的保有量;
(2)已知该地共享单车停放点第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc15640cf788f728e98518e73ef7b2a3.png)
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2018-03-28更新
|
3509次组卷
|
25卷引用:2017年普通高等学校招生统一考试数学(上海卷)
2017年普通高等学校招生统一考试数学(上海卷)上海市进才中学2018-2019学年高三上学期期中数学试题上海市奉城高级中学2019届高三上学期期中数学试题上海市实验学校2022届高三下学期5月月考数学试题上海市实验学校2023届高三上学期11月月考数学试题上海市第六十中学2022届高三上学期期中数学试题(已下线)重组卷04上海市南洋模范中学2024届高三上学期开学考试数学试题(已下线)专题6.5 数列的综合应用(讲)-浙江版《2020年高考一轮复习讲练测》(已下线)专题6.5 数列的综合应用(讲)【理】-《2020年高考一轮复习讲练测》(已下线)专题7.5 数列的综合应用(讲)-2021年新高考数学一轮复习讲练测(已下线)专题6.5 数列的综合应用(精讲)-2021届高考数学(理)一轮复习讲练测(已下线)专题08 数列的通项、求和及综合应用 第一篇 热点、难点突破篇(讲)-2021年高考数学二轮复习讲练测(浙江专用)(已下线)专题7.5 数列的综合应用(讲)- 2022年高考数学一轮复习讲练测(新教材新高考)江西省兴国县第三中学2021届高三上学期第一次月考数学(理)试题(已下线)专题09 数列-五年(2017-2021)高考数学真题分项(新高考地区专用)(已下线)专题07 数列的通项与数列的求和(讲)--第一篇 热点、难点突破篇-《2022年高考数学二轮复习讲练测(新高考·全国卷)》(已下线)第10讲 数学归纳法与数列综合应用-2(已下线)专题6.5 数列的综合问题(练)-江苏版《2020年高考一轮复习讲练测》(已下线)专题05 分类打靶函数应用与函数模型(练习)(已下线)专题21 数列解答题(文科)-3(已下线)专题21 数列解答题(理科)-4北师大版(2019) 选修第二册 突围者 第一章 第二节 等差数列 课时3 等差数列的前n项和(2)沪教版(2020) 选修第一册 高效课堂 册末练习江西省龙南中学2022-2023学年高二下学期期中数学试题
名校
6 . 若等差数列
与等比数列
的首项是相等的正数,且它们的第
项也相等,则有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb8608c94621f3cd52d678fa0e53fb8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-02-27更新
|
654次组卷
|
4卷引用:上海市风华中学2017届高三上学期期中数学试题
上海市风华中学2017届高三上学期期中数学试题【全国百强校】河南省南阳市第一中学2019届高三第十四次考试数学(文)试题(已下线)狂刷26 数列的综合应用-学易试题君之小题狂刷2020年高考数学(理)高中数学人教A版必修5 第二章 数列 2.5.3 数列的应用 (2)
名校
7 . 若数列
为等比数列,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62dd2df97d71cfc1444335fb15ffa86e.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0313eea2c65393728d83a287a8b799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62dd2df97d71cfc1444335fb15ffa86e.png)
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2018-01-20更新
|
278次组卷
|
3卷引用:上海市长宁、嘉定区2018届高三第一次质量调研(一模)数学试题
真题
名校
8 . 对于无穷数列{
}与{
},记A={
|
=
,
},B={
|
=
,
},若同时满足条件:①{
},{
}均单调递增;②
且
,则称{
}与{
}是无穷互补数列.
(1)若
=
,
=
,判断{
}与{
}是否为无穷互补数列,并说明理由;
(2)若
=
且{
}与{
}是无穷互补数列,求数列{
}的前16项的和;
(3)若{
}与{
}是无穷互补数列,{
}为等差数列且
=36,求{
}与{
}得通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429923b613004e1bb8fdb02cadeed703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627a57cd9fdb1f586f35d9825b6bcc0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88de515bf821fd6df39713b503393757.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31971306914638e5ceb1bbe437535d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
(3)若{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a1e1834076ee35b5c587a5184eb7aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686ece75006ad358f23314dc8a246e11.png)
您最近一年使用:0次
2016-12-04更新
|
258次组卷
|
4卷引用:2016年全国普通高等学校招生统一考试文科数学(上海卷精编版)
2016年全国普通高等学校招生统一考试文科数学(上海卷精编版)(已下线)2016年全国普通高等学校招生统一考试文科数学(上海卷参考版)北京市北京师范大学第二附属中学2019-2020学年高三上学期月考(11月)数学试题(已下线)专题21 数列解答题(文科)-2
名校
9 . (本题满分18分,第1小题4分,第2小题6分,第3小题8分)
已知数列
的前
项和为
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ba7477cc35295206e79e1cb7fb4f3d.png)
(1)若
,求数列
的前
项和
;
(2)若
,
,求证:数列
为等比数列,并求出其通项公式;
(3)记
,若对任意的
,
恒成立,求实数
的取值范围.
已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ba7477cc35295206e79e1cb7fb4f3d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859003d7a148e04e2935e8befbca8441.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/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ae7dfe5fbb574b9c0ea1d85f402d77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9591e5f1367c94a9a2b7499c3d6892d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e46493fd829e4eeed0c6153462287fa.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16c748e944bd0181b1c67dcd533b040.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145b6046bc80d0ffecc61ac67c87ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2abd5cef5c44dd03fab10eaeefe26dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2016-12-03更新
|
287次组卷
|
4卷引用:2015届上海市普陀区高三二模理科数学试卷
真题
10 . 已知数列
与
满足
,
.
(1)若
,且
,求数列
的通项公式;
(2)设
的第
项是最大项,即
,求证:数列
的第
项是最大项;
(3)设
,![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/b5f42c54034f4a2cb042fe30d19fdd40.png)
,求
的取值范围,使得对任意
,
,
,且
.
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/cb3f13eff0c44c188301b49b49fefe5f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/e93a8913908348e6b9088a884b5ad1c0.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/003e06b609af499284cf19c415f35faa.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/aa85e908d37f4f07946e833242e00844.png)
(1)若
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/923d6062ebda4d2693e317d693f95801.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/f69c1c1e57fd42628dcbc0fe38faacb5.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/cb3f13eff0c44c188301b49b49fefe5f.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/cb3f13eff0c44c188301b49b49fefe5f.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/32724ab334f84e8288301879e609cee4.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/3c8d793b2d544f4a87aebda734aa60b3.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/e93a8913908348e6b9088a884b5ad1c0.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/32724ab334f84e8288301879e609cee4.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f37cb085be8546b9d12f9711655518.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/b5f42c54034f4a2cb042fe30d19fdd40.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/8d8fb932870b4a6c80d10dfc9ce28dc3.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/6ae1a3f516b84f2ebb62a67e6789a2c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572141761069056/1572141766787072/STEM/d75cc436b08649188e11b70d5c591bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa01f03fb074bff35b35e07047d11b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab06ad69cd80c00320a636406b02953.png)
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