2023高一·上海·专题练习
解题方法
1 . 利用“如果
,
是大于1的自然数,那么
”的结论证明:
(1)如果
,
是正有理数,那么
;
(2)如果
,
是正有理数,那么
,
;
(3)如果
,
,且
与
均为有理数,那么
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f11f97a2ecc7a83e51921b64cd31a8.png)
(1)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67bed4fa1131f142837229d1bcd94d7c.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e0630a1632f6368fb824ebfdead0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be7f8d359661f301c9f29004d9caa0e.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b6a26ce1f4e4c6e1dedfd7287aea8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0779e51cc6cce5a6a1f17aab48e77ce2.png)
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2023高三·全国·专题练习
解题方法
2 . 已知
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a521891098b625f372ff648d110afe1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/574b3c0cdd4e1c6f3c77d43dc7e0603f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ec4399896254d7506dc73c51653e1a.png)
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3 . 已知函数
的定义域为D,若存在区间
使得函数
满足:
①函数
在区间
上是严格增函数或严格减函数;
②函数
,
的值域是![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46bc2c22621c164294428fee27b961c4.png)
,
则称区间
为函数
的“n倍区间”.
(1)判断下列函数是否存在“2倍区间”(不需要说明理由);
①
; ②
;
(2)证明:函数
不存在“n倍区间”;
(3)证明:当有理数
满足
时,对于任意n
,函数
都存在“n倍区间”,并求函数
和
所有的“10倍区间”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0195f699765021e2c6ea985e487971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e207cf62e3a7e282eac4c4a3455bbf9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46bc2c22621c164294428fee27b961c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda1b32a2ac436a267e47c9ccb621e1f.png)
则称区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(1)判断下列函数是否存在“2倍区间”(不需要说明理由);
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b78b98443d32512ddcfe86aefd507db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/028f5145fad99aa994b09c8ef698e2d2.png)
(2)证明:函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175da291995b66f7a5e4e770062fbaba.png)
(3)证明:当有理数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ecbfedde46d325dbbe88c139436923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda1b32a2ac436a267e47c9ccb621e1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da668452bf94a7df60422815ae3b3d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c904567c3b3734e1eca8d042ef7a7b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e87b5d998252950639557ec2b8946d0.png)
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