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                            區間&鄰域
===
區間: 介于某兩個實數之間的全體實數,著兩個實數叫做區間的端點
![](https://box.kancloud.cn/0e25a48488d9dae636ef2598f289e065_1206x476.png)
![](https://box.kancloud.cn/31b909e2b2782e9b23b45cda4188bbf8_770x397.png)
![](https://box.kancloud.cn/9f6de48f6e16922da813b80436dbf355_951x478.png)
![](https://box.kancloud.cn/b9570918425a3cec4499d0f52d9ffc24_1147x468.png)
![](https://box.kancloud.cn/dda3444725aeedd6b9a3018c44edfa81_1009x428.png)
![](https://box.kancloud.cn/305c69cc98ba21a72438ee0bdf6439a7_789x261.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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