第3章 不等式
3.1 不等关系(基础练)
一、选择题:在每小题给出的四个选项中,只有一项是符合题目要求的.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
A.![]() | B.![]() |
C.![]() | D.![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31c5582673c521cb8217b578d62d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d637eb72a1e499f98fbb29753f56382f.png)
A.![]() | B.![]() |
C.![]() | D.不能确定 |
【知识点】 由不等式的性质证明不等式解读 比较法 分析法解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ec7afc317d3bf5231add15144c510d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee4ccbf38fedb0c2f26f308b68132175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
A.![]() | B.![]() | C.![]() | D.![]() |
【知识点】 作差法比较代数式的大小解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9237dbe3a4f28962ef2870b4e7dab599.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5676a879604e8dff37834e858824cb6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848d4055ca831ecde46d1b666ba9e33d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9237dbe3a4f28962ef2870b4e7dab599.png)
A.①④ | B.②③ | C.①③ | D.②④ |
【知识点】 由已知条件判断所给不等式是否正确解读 比较对数式的大小
二、填空题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70568049147d1c78cfd5e6330554bdd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4449983ea4ea678b6ebf1aef8ae6825e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db796b223b35e52aa7b4114da8072f5.png)
【知识点】 利用不等式求值或取值范围解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4aeebc4f258cc253077b0e8b28a84c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f2416d1f75a45a314331146550832e.png)
【知识点】 根据线性规划求最值或范围解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f05930837039d924f84f12ec886733d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b32e1a1c8cb8f9fdab1d90cb9507c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d60a700a5a306f650c0bb85c07d0fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13abf1d7298444627d32294dca2f005b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c5b46e81044efa7090be7ae678ff72.png)
![](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/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2958030ec9d7543dda1f529593a915e2.png)
【知识点】 作差法比较代数式的大小解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d40748b7dd201cc57afc0b9d16789e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9297b58c70dd5e49a4e828b71a56a1db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d100c22435a23e017cfe6f535379d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d7009d4cbe7157d63ce50444443716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc8b26fb79c1f4d36130c41b18c0f9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eafd0e253a0a62512d50c656de3dc2e9.png)
【知识点】 作差法比较代数式的大小解读 由基本不等式比较大小解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf58420cbb89185ca6e99d2c63a50ddf.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
【知识点】 作差法比较代数式的大小解读
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/973c9b75cb5ee062ee3f3d5f07c2ede7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fa908532176ca0648fd85b60ab78e21.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcf492075ba76dd1b7b632756d07894.png)
【知识点】 解含参数的绝对值不等式解读 柯西不等式求最值解读