当前位置:首页>考研真题>名校杭二中高一下期末统测模拟试卷一,这道单选压轴不等式出的很漂亮!(附原卷和答案)

名校杭二中高一下期末统测模拟试卷一,这道单选压轴不等式出的很漂亮!(附原卷和答案)

  • 2026-06-14 23:40:05
名校杭二中高一下期末统测模拟试卷一,这道单选压轴不等式出的很漂亮!(附原卷和答案)

题目重述

题目:若不等式  对任意正实数  恒成立,则实数  的最小值为(  ).

A. 1 B. C. D. 2

【正确答案】 C


【标准答案】原卷解析(直接配凑法)

【解题证明】依题意,对任意正实数 ,不等式  恒成立,只需求出当  为正数时, 的最大值。

因为  为正实数,所以我们巧妙拆分系数:

利用基本不等式对后两项分别放缩:

当且仅当 ,即  时,等号成立。 由此可得 。 即  的最大值为 ,所以  的最小值为 


【妙解一】“等比数列”猜想法(选择题秒杀绝技)

【解题证明】对于这种形式对称、齐次的多元最值问题,等号成立的条件往往出现在变量存在特定规律时。在单选题中,我们可以大胆假设  成等比数列来寻找极值。

我们假设 )。代入目标表达式:

令 ),则 ,式子变为:

利用添项拆项法将分母因式分解:

代回原式:

配方求分母最小值:。 当 (即 )时,分母取得最小值 。 此时  的最大值为 。由于恒成立的  必须大于等于最大值,秒选 C。


【妙解二】均值不等式逆向配凑法(从答案反向逆推)

【解题证明】基本不等式取等号的条件是各项相等。通过妙解一我们探知了等号成立的比例为 。我们可以顺藤摸瓜,主动去配凑  和 

① 处理 : 已知 。将  拆分成这两项相乘:

② 处理 : 已知 。将  拆分成这三项相乘:

③ 相加得到:

合并同类项,各系数恰好统一: 系数: 系数: 系数:即原式 ,得出 


【妙解三】均值权重转移法(无需猜等号)

【解题证明】如果不依靠试探,如何想到上述的拆分系数? 目标是让最终展开式的  系数全部相等。原式中  出现了 3 次(权重极大),而  只在三次根号下出现了 1 次(权重极小)。 为了强行平衡最终的系数,我们需要“削减 ,补贴  和 ”。

在对 进行凑时,给  除以 2,给  乘以 2:

在对  实行凑时,重度削弱 (除以 4),大幅补贴 (乘以 4):

两者相加,由于权重的精准分配,系数自然为整齐的 


【妙解四】等号条件换元法(化繁为简,标准答案级优美)

【解题证明】为了在使用基本不等式时保持代数结构的绝对对称,我们引入换元法,将等号成立的比例常数吸收到变量内部。

由上述方法可知极值点为 。 令 ),这样取等条件就变成了极美的 。 代入不等式左边:

化简常数:

对后两项分别使用基本不等式:

将上述放缩结果相加:

再将换元的变量还原:

当且仅当  时等号成立,逻辑严密。


【妙解五】主元降维齐次化法(化三为二,微积分降维思想)

【解题证明】观察原不等式,左右两边的项均为“一次齐次式”。面对多元齐次不等式,标准高级动作是同除以主元进行降维。 不等式两边同除以 ,令 )。

原问题转化为求二元函数  的最大值:

由极值点分析,当  时取到最值。 我们针对这一条件进行带常数的基本不等式放缩:

① 放缩 (引入常数  以凑等号):

② 放缩 (将  拆为在此条件下相等的 ):

③ 代回分子累加:

两边同除以  即得:

所以  的最小值为 

当然,后面几种方法都是在取等条件已经猜出来的前提下得到的。当然,我们可以用待定系数法把答案弄出来,再用几个秒解补充书写。

原卷如下

答案如下

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  1. CONNECT:[ UseTime:0.000506s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000960s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000258s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000446s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 502696 LIMIT 1 [ RunTime:0.000495s ]
  9. UPDATE `article` SET `lasttime` = 1781614355 WHERE `id` = 502696 [ RunTime:0.005435s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000279s ]
  11. SELECT * FROM `article` WHERE `id` < 502696 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000482s ]
  12. SELECT * FROM `article` WHERE `id` > 502696 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000370s ]
  13. SELECT * FROM `article` WHERE `id` < 502696 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000585s ]
  14. SELECT * FROM `article` WHERE `id` < 502696 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000610s ]
  15. SELECT * FROM `article` WHERE `id` < 502696 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001537s ]
0.082929s