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                            # 乘方

`a2`  
- 下面的a是底數
- 2是指數

算術叫做`乘方`, 計算結果叫做`冪`

a2 = a × a
a3 = a × a × a
a? = a × a × a × a
a? = a × a .......n.......... × a

---

```
42 = 16
-52 = -25 (只能管最近的數)
(-52) = 25 (管括號內的所有, -5 × -5 = 25   因為負負得正)
```




# 視頻學習

- [https://www.bilibili.com/video/BV1px411V7YG](https://www.bilibili.com/video/BV1px411V7YG?from=search&seid=10387934992607871791)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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