2020高三·全国·专题练习
解题方法
1 . 已知函数
.
(Ⅰ)若不等式
有解,求实数
的最大值
;
(Ⅱ)在(Ⅰ)的条件下,若正实数
满足
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c5670d52c80493089f86da7b0a7e5f.png)
(Ⅰ)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a69c70c5cd88b38b80b0f8065835bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(Ⅱ)在(Ⅰ)的条件下,若正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8242728ec43eb5ba68012f1cf2efe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f67da3adba52a5a2a98d4d94a22fbef8.png)
您最近一年使用:0次
名校
2 . 已知函数
,
,且
的解集为
.
(1)求
的值;
(2)若
,
,
是正实数,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d256aa8e400f959fc209a512b4ef890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2725a89d93c791f7a0098f4964587905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d619ca29fc5425709e42d6f121a5d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e99bebf8db0d314aacb2cb1f09bf48c.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c321b3d7476442ac8aabc81a553a72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70a2b2d64261724eb74ec7e50db4f7a.png)
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2020-05-01更新
|
402次组卷
|
4卷引用:河北省正定中学2019-2020学年高三下学期第四次阶段质量检测数学(文)试题
3 . 已知a,b,c均为正实数,函数
的最小值为1.证明:
(1)
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21467d142bbd2dc063f8b208dc78f48c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92fa3ce73a935d89ac023bf9bc2136d5.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb218935dea452cc51bf841bd8f48c45.png)
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2020-06-09更新
|
546次组卷
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5卷引用:2020届河南省六市(南阳市、驻马店市、信阳市、漯河市、周口市、三门峡市)高三第二次联合调研检测数学(理科)试题
解题方法
4 . 已知函数
是奇函数.
(1)求
,并解不等式
;
(2)记
得最大值为
,若
、
,且
,证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d11cbb0233bae1a97f29f6ebd87d969.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99f6241f03f76761403af0c53d3a0f1.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f96105f1639c6566db428c91b7f1a7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39dc86044cf2704cdcebf9d6d42703b4.png)
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2020-06-19更新
|
423次组卷
|
3卷引用:福建省厦门市2020届高三毕业班(6月)第二次质量检查(文科)数学试题
名校
解题方法
5 . 已知
,且
.
(1)求
的最大值;
(2)若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/baca30d4248a82988890bd032d159b25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f9223bc24df8d429d743692fff7c06.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53aac8ed7ecc41d22656d55b76cbd6b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3535a55591ee1a64ae85aa1ea304d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9ccff26e1a5e122b7ed7660dcac0d70.png)
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2020-05-29更新
|
881次组卷
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7卷引用:2020届四川省宜宾市高三高考适应性考试(三诊)数学(理科)试题
2020届四川省宜宾市高三高考适应性考试(三诊)数学(理科)试题2020届四川省宜宾市高三高考适应性考试(三诊)数学(文科)试题四川省宜宾市高县中学2021-2022年高三下学期阶段复习数学(文)试题四川省宜宾市高县中学2021-2022年高三下学期阶段复习数学(理)试题(已下线)2022年全国高考甲卷数学(文)试题变式题13-16题(已下线)2022年全国高考甲卷数学(文)试题变式题21-23题(已下线)专题10-2 不等式选讲题型归类(讲+练)-1
2018高三·全国·专题练习
解题方法
6 . 已知大于1的正数x,y,z满足x+y+z=3
.求证:
+
+
≥
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a84b3f0ca378e500a7a1180b02d2444c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d20960e20f50943dec17aaef067047.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d710d955207a11910efe7669b35e1df5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
您最近一年使用:0次
解题方法
7 . (1)解不等式:
(2)设
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e203d1e78857543b486576e61c2e59a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/089b9e23434379c309189e94bf59e0c4.png)
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2018-07-30更新
|
385次组卷
|
2卷引用:陕西省黄陵中学2017-2018学年高二(重点班)下学期期末考试数学(理)试题
解题方法
8 . 设
都是正实数,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8436f067b7e4048dd0335f3fdb7e27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbce45c5489b8294b33eba4d1d2b21e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e48426cf2c5b8571443f321d3b2e156.png)
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9 . ①设三个正实数a , b , c , 满足
,求证:a , b , c一定是某一个三角形的三条边的长;
②设n个正实数 a1,a2,...an 满足不等式
(其中
),求证: a1,a2,...an 中任何三个数都是某一个三角形的三条边的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc46800ddc98674dbcd163fa7d328d1.png)
②设n个正实数 a1,a2,...an 满足不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37348afa25a4b4c5546b1db82e2cd241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bcfc48f9bc23cc43085bdb910e7a136.png)
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10 . 若
,求证
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5b0d3791ebdb32447727b22a9cbe30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ab4410590726beed717151a8bdf030.png)
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