解题方法
1 . 证明下列结论.
(1)已知
,试用综合法证明:
;
(2)已知
,且
,试用分析法证明:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf04fe8895c10624636a815d3d752975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0da537e5284dc9786845fca39a9ca913.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8954db00a1de8263871cf3e26965eb4b.png)
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2022高三·全国·专题练习
2 . 设不等式组
表示的平面区域为
,设
内整数坐标点的个数为
.设
, 当
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf7014de5cbe63dca175543775c19814.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab5587f937dcd892b7cc0b69065b126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65d52ce074304be72992e6695a44f71c.png)
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3 . 已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b86eff6d1841d0bc77000eb4c7e180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa7584fcb7c6b8770d061c09158fcd1.png)
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4 . 已知a,b,c都是正实数,
,用三种方法证明:
.
(1)分析法;
(2)综合法;
(3)反证法.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8845c0d06613fabb0358d5392cca38b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f00cfcbd5f96bab94e532a2e79204e.png)
(1)分析法;
(2)综合法;
(3)反证法.
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2021-11-14更新
|
543次组卷
|
3卷引用:2.2.1 不等式及其性质
5 . (1)求证:
;
(2)已知
,
,且
,用反证法证明:
和
中至少有一个小于2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94b3d03b6098d2f3f30d213d830d6a84.png)
(2)已知
![](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/69bbd0aae5a4f6129fc78f88f662f092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5360e1dce424ae202f4ca4e5b842499f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/361751a03c628b8ddb0952a7390f7810.png)
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2021-10-13更新
|
283次组卷
|
4卷引用:1.2反证法(第3课时)
6 . 已知
.
(1)若
,
,证明
为锐角三角形;
(2)如图,过顶点
作
,垂足
位于边
上.若
且
,证明
不是直角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32841dea3e0f06078e09450d29dbfac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994eeb7944c572291623825627af7ea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图,过顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacfdde1c91d4404be2fdf515a03437d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/f9272433-89e2-4fe7-9df7-e62ab88224ad.png?resizew=168)
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7 . 按照要求证明下列不等式.
(1)已知
,用综合法证明:
;
(2)用分析法证明:
.
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb54b1b3617ebc502cb44194cbcd1dc.png)
(2)用分析法证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceed227c026ff8d94237c63ace92cf78.png)
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8 . (1)证明:
,对所有实数
均成立,并求等号成立时
的取值范围.
(2)求证:
是无理数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4e87bd6addd7ad01e563856c068e34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8242dce48218efc02663b59905fb7df.png)
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9 . (1)设
,用综合法证明:
.
(2)设
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada798eeba5bd19d497bfd0741afd00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a737185eb85ca24cf66409ce1e09bc.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1caa2030ac2f57deccc5b24e940facc9.png)
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2021-04-02更新
|
293次组卷
|
3卷引用:2.2.1 不等式及其性质
10 . 已知
的三边长分别为
、
、
,且其中任意两边长均不相等,若
、
、
成等差数列.
(1)证明
;
(2)求证:角
不可能是钝角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/071a7e733d466949ac935b4b8ee8d183.png)
![](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/d26302e47e2926b0e807952b0efe7463.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128c02c6fe7314fad4dd3b4a9da8a817.png)
(2)求证:角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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2020-06-15更新
|
229次组卷
|
4卷引用:1号卷·A10联盟2022届全国高考第一轮总复习试卷数学(理科)试题(十二)
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