20-21高二上·全国·单元测试
解题方法
1 . 设集合W由满足下列两个条件的数列{an}构成:①
;②存在实数M,使an≤M(n为正整数)
(1)在只有5项的有限数列{an}、{bn}中,其中a1=1,a2=2,a3=3,a4=4,a5=5,b1=1,b2=4,b3=5,b4=4,b5=1,试判断数列{an}、{bn}是否为集合W中的元素;
(2)设{cn}是等差数列,sn是其前n项和,c3=4,s3=18,证明数列{sn}∈W,并写出M的取值范围;
(3)设数列{dn}∈W,对于满足条件的M的最小值M0,都有dn≠M0(n∈N*)求证:数列{dn}单调递增.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc75a9da38151496ca2adce84a977b96.png)
(1)在只有5项的有限数列{an}、{bn}中,其中a1=1,a2=2,a3=3,a4=4,a5=5,b1=1,b2=4,b3=5,b4=4,b5=1,试判断数列{an}、{bn}是否为集合W中的元素;
(2)设{cn}是等差数列,sn是其前n项和,c3=4,s3=18,证明数列{sn}∈W,并写出M的取值范围;
(3)设数列{dn}∈W,对于满足条件的M的最小值M0,都有dn≠M0(n∈N*)求证:数列{dn}单调递增.
您最近一年使用:0次
2 . 调查某地居民每年到商场购物次数
与商场面积
、到商场距离
的关系,得到关系式
(
为常数).如图,某投资者计划在与商场
相距10km的新区新建商场
,且商场
的面积与商场
的面积之比为
.记“每年居民到商场
购物的次数”、“每年居民到商场
购物的次数”分别为
,
,称满足
的区域叫做商场
相对于
的“更强吸引区域”.
与
相距15km,且
.当
时,居住在
点处的居民是否在商场
相对于
的“更强吸引区域”内?请说明理由;
(2)若要使与商场
相距2km以内的区域(含边界)均为商场
相对于
的“更强吸引区域”,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3434e1664f467fabfa28d5f9115f387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3de67b8fc083f137ebbb82e6c2ba33cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ab1256702aef4e9f1a5eb6c12ecc96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbd67f60f04c278bdd867fdb3979dfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf32171461f12fc1edf54b9ec44efea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e12bfde565540f059dd27ea47dfaa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3cf0f585938ede9eca890a6eb326d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若要使与商场
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
3 . 设
为正整数,区间
(其中
,
)同时满足下列两个条件:
①对任意
,存在
使得
;
②对任意
,存在
,使得
(其中
).
(Ⅰ)判断
能否等于
或
;(结论不需要证明).
(Ⅱ)求
的最小值;
(Ⅲ)研究
是否存在最大值,若存在,求出
的最大值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c724c6119e3e17b6181178ce7e6baf75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d1fd5262cae918d9c8ef6a1bede788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33f84aa794bc075d6139177cd2f59925.png)
①对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbba3561714a2b7b7b675e4c319e4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b375f090c551bb2817fa942edbf9bd05.png)
②对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165df5a77d87e7c534898e995f162562.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bbba3561714a2b7b7b675e4c319e4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5de90d938c439d3a9a8e5e1880604f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927a02889cbfc416da88181520058c3a.png)
(Ⅰ)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6b5ca66b71ac5daa42ce59f19f72d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432851e0d0b7a2924da29b9cc5ca1706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6b3e4ab38102e50c861c13496bd215.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(Ⅲ)研究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
2020-05-12更新
|
914次组卷
|
2卷引用:2020届北京市西城区高三诊断性考试(二模)数学试题
名校
4 . 已知函数
.
(1)设
,证明:
;
(2)设
,证明:
;
(3)设
都是正数,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f394beb581f75eb7efa71735b6f849.png)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596004d85b69e05f9551dec3be53d7a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c35b36213a897b6887b39ad0b971e3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0adc67e0d7d3a7c501af506df484f23d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e29df1029ef1f3321e2301cd179618c.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ede3df8c9f8a40639cd9f8267414117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a399a276e30510e557b42ee5db5510b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b150975cb85995a57a7036481f476f.png)
您最近一年使用:0次
名校
解题方法
5 . (1)解不等式
.
(2)设
表示
的解集;
表示不等式
对任意
恒成立的
的集合,求
;
(3)设关于
的不等式
的解集为
,试探究是否存在自然数
,使得不等式
与
的解都属于
,若不存在,说明理由.若存在,请求满足条件的
的所有的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/160f68000b902eef7c47c95f055c2d04.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee96a17986a05fb4d8afac6ed25af10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa70964576558e912ac311efe800ebe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4afabfd5b4885311f8d9a4bcf791b71.png)
(3)设关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789bcc64778a85418ac54d41d1798a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700fa4dfbe1d291042d435778db55f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc21ccecbbb5acfff1ab104b6b8265f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
解题方法
6 . 若实数x﹑y、m
满足
,则称y比x接近m.
(1)若
比1接近0,求x的取值范围;
(2)对正实数a,b,如果
比
接近2,求证:当
时,
比
接近2;
(3)已知函数
等于
和
中接近0的那个值.写出函数
的解析式,并指出它的单调区间(结论不要求证明).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4a7dd81a499fbb8baf5a094c6c87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9965755486b6b0887a2fcd0dc16e702b.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e1fbe0fb49725cf6d1e689ee8986d6.png)
(2)对正实数a,b,如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b52159c4f340e243c243988c9469106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd46e6f8f462d69e3b88c3245a7585d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d5750417af6a1d63b064c467414502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e778bb8ded9102f97acddffbc03130.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da4fcad0fbcfd1c4811d5f84a1727119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65d0fbf9e5420e150263e457676c80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
您最近一年使用:0次
7 . 设
为下述正整数
的个数:
的各位数字之和为
,且每位数字只能取
,
或![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(1)求
,
,
,
的值;
(2)对
,试探究
与
的大小关系,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
(2)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cac657ea5bbf4b237a30e4074c76cc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd12570de0a4883407dc50eea28e011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c3ada10cd62cec32c5ffc7bd17d3599.png)
您最近一年使用:0次
8 . 已知函数
,
.
Ⅰ
记
在
上的最大值为M,最小值为m.
若
,求a的取值范围;
证明:
;
Ⅱ
若
在
上恒成立,求a的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e75613d81de6fe1309da3f046f8a366.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980a8c4eb822aeb591ceacfe8a7aaa11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a29726cb09e82862db881a3258c34b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372470aee75717ec33c53c3434eb126d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ea4f4e439a11a84a4445b4c8c0c96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18eca8193d91e13a240dec14be339cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b8845bd03ac01a26ef57851a8764cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c1472bd3540ad41abb5b0d8c4d8a66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35246b1f7e094e6e7ea093f2f53a1a3f.png)
您最近一年使用:0次
13-14高一下·广东揭阳·期中
名校
9 . 已知定义域为
的函数
同时满足以下三个条件:
(1) 对任意的
,总有
;(2)
;(3) 若
,
,且
,则有
成立,则称
为“友谊函数”,请解答下列各题:
(1)若已知
为“友谊函数”,求
的值;
(2)函数
在区间
上是否为“友谊函数”?并给出理由.
(3)已知
为“友谊函数”,假定存在
,使得
且
, 求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1) 对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1376168658dbe7f5b7f4d75fb1db545a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87cd4403487962c38c8707ba3ab3fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12aae852c3129efc16934aefc54201f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cd2fe62ffe3caa1c6f7976851c9dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f51cd760aeff9365b51e9a85b41e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27928aa83370ffb7e137019ff03c3e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)若已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54b6a060d6c51a328341df76013bd89.png)
(2)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/078d5da73e5aa679bc163820b7b73f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc0414f6c290d1dc3678ba41b4620f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c22b0b866e6181ac3c39c9c1db91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4415137475716480dfb80957285379f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73bc955d158efde0bdd62d14a60a65e3.png)
您最近一年使用:0次
2016-12-03更新
|
1861次组卷
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3卷引用:2013-2014学年广东省揭阳一中高一下学期期中学业水平测试数学试卷
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2010·广东·一模
名校
10 . 对于定义在区间D上的函数
,若存在闭区间
和常数
,使得对任意
,都有
,且对任意
∈D,当
时,
恒成立,则称函数
为区间D上的“平底型”函数.
(Ⅰ)判断函数
和
是否为R上的“平底型”函数? 并说明理由;
(Ⅱ)设
是(Ⅰ)中的“平底型”函数,k为非零常数,若不等式
对一切
R恒成立,求实数
的取值范围;
(Ⅲ)若函数
是区间
上的“平底型”函数,求
和
的值.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2a2d903ba240a8b9a5ffc89d253c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df8fcc03f1fbc04e581c54d481543a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82639cc42b3278ddb550fcd40550cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9287c65e8e6c68fd2a43cd68a4ed308e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e65ce6beb859d217affa006e8bd355.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(Ⅰ)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e64da1f043ad0c3fd44f6c24eaa6459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca2d1b039514228cb725445f3d6f8df.png)
(Ⅱ)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9d2218ca8690645409c8c93f8d7659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb1d808cf4ff5ea1a3399c2d25656a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(Ⅲ)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46bf94f9a3b0a0cc75158b6073ffc9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a7ab1aba1cdf4453848ccece383b12e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
.
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