题目
题型:单选题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-53818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-58767.png)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-53818.png)
数,若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200936-79276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200936-36385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200936-81586.png)
A.恒小于零 | B.可能为零 | C.恒大于零 | D.不确定 |
答案
解析
由
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-58767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200936-19794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-53818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200937-46575.png)
因为当
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200936-35831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-53818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200937-25490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-53818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200937-49365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200935-58767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200937-70656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200937-32942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200938-75699.png)
答案 C
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200934-38823.png)
为( )
A.2 | B.0 | C.—1 | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200930-22381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200930-85252.png)
在的区间是( )
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200931-33669.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-58750.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-85217.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-76333.gif)
方法近似计算积分
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-88230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-41371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-85217.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200929-63893.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200929-79813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-41371.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200929-70335.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200929-44180.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200929-13859.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200928-88230.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200923-26116.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-99127.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200923-26116.gif)
(2)请你认真研读(1)中命题并联系以下命题:若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-99127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-26026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200925-52188.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200925-15507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-26026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200925-88902.gif)
设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-99127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-26026.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200925-29284.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200925-91736.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200926-90699.gif)
则 是
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200924-26026.gif)
注:命题的普遍化就是从考虑一个对象过渡到考虑包含该对象的一个集合;或者从考虑一个较小的集合过渡到考虑包含该较小集合的更大集合。
(3)证明(2)中建立的普遍化命题。
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200915-87714.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200915-40347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200915-40992.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200915-81082.gif)
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![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819200915-58761.gif)
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