解题方法
1 . 已知a,b,c为正实数,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a7230fe9f2a64eada856831363ad3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6925b73fefa089736e2ebddfc1800e.png)
您最近一年使用:0次
解题方法
2 . 已知函数
.
(1)求
的最小值
;
(2)若正实数
、
、
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cbd066f1749c5137dc5ed5be51bb1bc.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d42aabb19773fce295b7af6d748e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若正实数
![](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/db6cedcfa8b128453e3e680e372bcf28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a854bbc7958d352e8b334d2b633327a7.png)
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2020-06-04更新
|
254次组卷
|
2卷引用:百校联盟2020届高三5月教育教学质量监测考试(全国Ⅰ卷)文科数学试题
名校
解题方法
3 . 若
,则
的最大值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c68995dca1bcf524763a0ef4c65bba43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10248b37f5d9a280b2672110db677a04.png)
A.9 | B.3 | C.1 | D.6 |
您最近一年使用:0次
解题方法
4 . 已知
,
,且
.
(Ⅰ)若对于任意的正数
,
,不等式
恒成立,求实数
的取值范围;
(Ⅱ)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04959523a28786962d51cfb43a8767d7.png)
(Ⅰ)若对于任意的正数
![](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/46bfeb06a3ca0c92af38e51a1dad303c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2274aeecab57750e0fcac7fd25ff55.png)
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解题方法
5 . 已知
,
,
.
若
,求证:
;
若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4d684b78f6e4a759f11bc25f7c9a53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/876c4544446608ec7250944fa091d51e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a57e060f61f7efa54982bda67db483a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2219d312e275702451d6323cd3e7ac67.png)
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2020-05-16更新
|
505次组卷
|
2卷引用:广西壮族自治区桂平市第五中学2019-2020学年高三下学期联考数学(文)试题
解题方法
6 . 已知x、y、z均为正数,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9b4a957b3185b07a6840c1ab6bb431.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbc3756ab2bb0ed3b22ddb5bef9d50f.png)
您最近一年使用:0次
名校
解题方法
7 . 已知
,
,且
.
(1)若对于任意的正数a,b,不等式
恒成立,求实数x的取值范围;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04959523a28786962d51cfb43a8767d7.png)
(1)若对于任意的正数a,b,不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77117a32e30647b14f4fed07d7716ba1.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2274aeecab57750e0fcac7fd25ff55.png)
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2020-05-09更新
|
402次组卷
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2卷引用:2020届安徽省安庆市高三第二次模拟理科数学试题
8 . 已知实数
、
、
满足
,
,
,
,求证:
.
![](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/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cec12441802f71e803efaf2c62ee588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea63bc7cb16bb72fd3fe1a58bec5143b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8720d2743b33079a807740dc0d761ad.png)
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2020-05-09更新
|
281次组卷
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3卷引用:2020届江苏省泰州市高三下学期调研测试数学试题
名校
9 . 已知a、b、c∈R+,且
.
(1)当
时,求
的最小值;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee462ae9f94817cd2f7695858e7b7f83.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f668fc7372e4cb404ebe508363edc03b.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52984582dd5bd206cd14957b9827c1e5.png)
您最近一年使用:0次
2020-05-04更新
|
245次组卷
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2卷引用:东北三省三校(哈尔滨师大附中、东北师大附中、辽宁省实验中学)2019-2020年高三第二次联合模拟文科数学试题
名校
10 . (1)已知
、
、
是正数,且满足
,证明
;
(2)已知
,求
的最小值.
![](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/56667aabbe787eb1c3189d487d203e22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3681a97ebef383e8968347548102fb49.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09568754a8422dd90e9cb040b4c70544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f352f97803f55b21c0dd569caa4956f9.png)
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