题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150946-33603.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-16438.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-16471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-82112.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-78153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-14628.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-33980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-17464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-97821.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
①
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-16438.png)
②若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-16471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-82112.png)
③若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150947-78153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150950-55902.png)
④若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-33980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-17464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150948-97821.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150929-15539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150930-86716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150930-52096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150930-73720.png)
①如果
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-89443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-93022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-67637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-89443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-29121.png)
③如果
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-29121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-89443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150931-89443.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150932-44736.png)
其中真命题为 ( )
A.① | B.② | C.③ | D.④ |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150805-40910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150805-59547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150805-67673.png)
试确定
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150805-40910.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150602-52093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150602-10180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150603-14263.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150603-57295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150603-60990.png)
A.0 | B.1 | C.2 | D.3. |
A.ab+bc+ca>0 | B.ab+bc+ca<0 |
C.ab,bc,ca均为负数 | D.abc<0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150531-92829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015150531-63599.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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