1 . 已知函数
.
(1)当
时,讨论函数
的单调性;
(2)设
,当
时,若对任意
,存在
,使
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5da52b17d491c0e834da6fe9c8b34667.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80b3e551ccac533bfb82003a6940f6be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87348f632b0064b0e305133c4e149f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb6f90479ab6f0ad3492c923544854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea9655f1d25bb28f5433759c1aa2786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
11-12高三·江西南昌·阶段练习
名校
解题方法
2 . 已知函数
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bd49ff330ca8099194addffdf59c61.png)
(1)若
,求函数
的极值;
(2)设函数
,求函数
的单调区间;
(3)若存在
,使得
成立,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7baac46881798c16564d0e59e94afbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14bd49ff330ca8099194addffdf59c61.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa662f0273f0921c1fa4727f632395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a813b5adbf5c7082561237894ba6d599.png)
(3)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e706051d05d5332ab6e4392f19d8ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a15b08b750e803abcd24b6cf0e6f7b4.png)
您最近一年使用:0次
2021-11-11更新
|
2768次组卷
|
22卷引用:江西省赣州市寻乌中学2016-2017学年高二上学期期末考数学(理)试题
江西省赣州市寻乌中学2016-2017学年高二上学期期末考数学(理)试题2014-2015学年海南省海南中学高二上学期期末考试理科数学试卷宁夏吴忠中学2021-2022年高二下学期期末考试数学(理)试题天津市河东区2024届高三上学期期末质量调查数学试题(已下线)2013届江西省南昌二中高三第四次月考理科数学试卷2015届北京市石景山区高三3月统一测试(一模)理科数学试卷河北省定州中学2018届高中毕业班上学期第三次月考数学试题(已下线)2017-2018学年度下学期高中期末备考【通用版】高二【精准复习模拟题】C【拔高卷02】【文科数学】(教师版)2019届天津市耀华中学高三下学期第二次校模拟考试数学(文)试题北京市怀柔区第一中学2022届高三10月月测数学试题北京市第十五中学2022届高三上学期期中考试数学试题天津市第二南开学校2021-2022学年高三上学期期中数学试题(已下线)专题37 导数证明恒成立问题大题必刷100题-【千题百练】2022年新高考数学高频考点+题型专项千题百练(新高考适用)重庆市壁山来凤中学校2021-2022学年高二下学期4月月考数学试题天津市红桥区2023届高三二模数学试题天津市实验中学2023届高三考前热身训练数学试题天津市嘉诚中学2022-2023学年高二下学期期中数学试题天津市第二南开学校2024届高三上学期10月阶段评估数学试题北京市西城区北师大二附中2024届高三上学期期中数学试题(已下线)专题19 导数综合-1(已下线)黄金卷07天津市天津益中学校2023-2024学年高二下学期期中学情调研数学试卷
名校
3 . 已知
在区间
,
上的值域
,
.
(1)求
的值;
(2)若不等式
在
,
上恒成立,求实数
的取值范围;
(3)若函数
有三个零点,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cb39dd7a9741c2e6796ce20a0910971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f124fb9eab689c537bb5ddf5012e35f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d141db3e7187a57e67798d8844073d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17fff6cad52af74309c2d811fa5e508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4caee21c29aa2410ea04b3fc2d80cd.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f4b72bb19e180dc63e6d8e1ede1339.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e96e9a314387fa1c76e86179ee0121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a89c09d40f1ca26c70beadd071658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccafe91e5e154bc67b273df39fb16a37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2020-09-22更新
|
1767次组卷
|
9卷引用:江苏省苏州市2016-2017学年高一下学期期末备考试题分类汇编:函数的零点数学试题
江苏省苏州市2016-2017学年高一下学期期末备考试题分类汇编:函数的零点数学试题江苏省盐城市伍佑中学2017-2018学年高一上学期期末考试数学试题甘肃省天水市第一中学2017-2018学年高一上学期第二次考试数学试题甘肃省天水一中2017-2018学年高一(上)期中数学试题(已下线)2017-2018学年度下学期高中期末备考 【浙江版】高一【精准复习模拟题】 拔高卷01【教师版】【全国百强校】四川省雅安中学2018-2019学年高一上学期期中考试数学试题江苏省苏州外国语学校2020-2021学年高一上学期12月检测数学试题广西壮族自治区钦州市第四中学2023届高三上学期10月考试数学试题(已下线)专题2-7 导数压轴大题归类-2
名校
解题方法
4 . 已知椭圆
,焦距为2,离心率
为
.
(1)求椭圆
的标准方程;
(2)过点
作圆
的切线,切点分别为
,直线
与
轴交于点
,过点
的直线
交椭圆
于
两点,点
关于
轴的对称点为
,求
的面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f85f1a0c955c915aefe3fcdc9d7eed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe659fb4ca96554eeefd6a305ea1a70d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e24e9da4baf5f37f723a7577d2cb30f5.png)
您最近一年使用:0次
2020-04-08更新
|
791次组卷
|
7卷引用:2017届安徽省宿州市高三第一次教学质量检测(期末)理数试卷
5 . 设函数
和
都是定义在集合
上的函数,对于任意的
,都有
成立,称函数
与
在
上互为“互换函数”.
(1)函数
与
在
上互为“互换函数”,求集合
;
(2)若函数
(
且
)与
在集合
上互为“互换函数”,求证:
;
(3)函数
与
在集合
且
上互为“互换函数”,当
时,
,且
在
上是偶函数,求函数
在集合
上的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc595518cf752e1c7903dfff93dbda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298b861acdad2f218a882319c1a3280a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(1)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d761c4444f5eac17133caaf19d6b9ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588bbf780d49cf4d29802c2e4126f112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95ff35f3b50966a5e3cbb0b5977af7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0ba94c781da05ac6ca38261904b40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
(3)函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c395237799431ccbd691c17d5c78ac3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a292b39ec75214652cb000bfa8310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96bafcae32d0b273c95d1bd70fa01c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05486718d0f498abca5c2c21912bb26d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1be9a7177c28cc52018fddf300e5b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc30165c18de623d0a3efb961e606d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2020-02-01更新
|
1542次组卷
|
3卷引用:上海市嘉定区封浜高级中学2016-2017学年高一下学期期末数学试题
上海市嘉定区封浜高级中学2016-2017学年高一下学期期末数学试题上海市嘉定区2016-2017学年高一下学期期末数学试题(已下线)第五章 三角函数(选拔卷)-【单元测试】2021-2022学年高一数学尖子生选拔卷(人教A版2019必修第一册)
6 . 设函数
的反函数为
,若存在函数
使得对函数
定义域内的任意
都有
,则称函数
为函数
的“Inverse”函数.
(1)判断下列哪个函数是函数
的“Inverse”函数并说明理由.
①
;②
;
(2)设函数
存在反函数
,证明函数
存在唯一的“Inverse”函数的充要条件是函数
的值域为
;
(3)设函数
存在反函数
,函数
为
的一个“Inverse”函数,记
,其中
,若对函数
定义域内的任意
都有
,求所有满足条件的函数
的解析式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a2a1822ac7392b61b2c0fffc1fbc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346b6e84aa00abca0241eb18b6a5e38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(1)判断下列哪个函数是函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45afdf4d717bb03adac6b899c367acb.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0febd73692b5a2d8b559c2b4bb67ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c8904fa3def3f943c3d2ab20dbc632e.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a2a1822ac7392b61b2c0fffc1fbc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12042034d9bc24cc31f15895dce44b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a2a1822ac7392b61b2c0fffc1fbc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641067daedeade49b5d9924c6e245cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e39e176af5b23719580d925e792aa8b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee724824f6623445bf571d1fffc5c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
您最近一年使用:0次
名校
7 . 若函数
在
内有两个零点,则实数
的取值范围为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b8a6e8d9576fb20fb630dd1d2e309c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44c106703fb8213ed2e9b6cf154f8a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
8 . 数列
,
中,
为数列
的前
项和,且满足
,
,
.
(1)求
,
的通项公式;
(2)求证:
;
(3)令
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebaf2a2590bb84d646957f913d78f6dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3fb9da400018c820272970b3f95660d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524efe57272af10632cd01af7fb6b840.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7416a32d2619d72a01847b63ee80a9b4.png)
(3)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe62e27d9f294191ef325ca302b79515.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d350c9b188654333954f21d0d3e95e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8a297f08ce344485429aa20cf8c38c.png)
您最近一年使用:0次
2018-02-02更新
|
948次组卷
|
3卷引用:浙江省台州市2017-2018学年第一学期期末高三数学试题
名校
解题方法
9 . 设函数
.
(1)当
时,求
的单调区间;
(2)当
时,
恒成立,求
的取值范围;
(3)求证:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d452de0c661afbb8a60361c66da5b372.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d1e281f89f17d958553664afd958bb3.png)
您最近一年使用:0次
2018-01-07更新
|
1395次组卷
|
10卷引用:贵州省铜仁一中2016-2017学年高二下学期期末数学(理)试题
贵州省铜仁一中2016-2017学年高二下学期期末数学(理)试题江西省莲塘一中2018届高三9月质量检测文科数学试题江西省赣州市寻乌中学2017-2018学年高二上学期期中考试数学(理)试题(已下线)黄金30题系列 高三年级数学江苏版 大题易丢分四川省遂宁中学校2019-2020学年高二下学期第二次月考数学(文)试题四川省广安市第二中学2021-2022学年高二下学期第一次月考数学(文)试题山东省临沂市2021-2022学年高二下学期期中数学试题江苏省镇江中学2021-2022学年高二下学期期中数学试题山东省聊城市聊城一中东校2021-2022学年高二下学期期中模拟数学试题(四)广东省江门市台山市华侨中学2021-2022学年高二下学期期中数学试题
解题方法
10 . 已知数列
满足:
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284d563db7f923efe3651d9dae19b6e4.png)
.
(1)求
;
(2)证明:
;
(3)是否存在正实数
,使得对任意的
,都有
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284d563db7f923efe3651d9dae19b6e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d5fa85887816de29bcff4f143e3f0c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecc2ab9d4270f7aec50a7a8e2a78a603.png)
(3)是否存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a70b95c53fb6655721e2a8c61f5c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19e560b7b29be22057b8e796182f291.png)
您最近一年使用:0次