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                            ## 單項式定義
> 分母中函有字母的式子不叫單項式，叫分式

![](https://box.kancloud.cn/2229d7767eb7038fc09972103414a6e1_618x267.png)


&nbsp;
## 單項式的指數與系數
> 相當于描述這個單項式的身高和體重

![](https://box.kancloud.cn/22824c9eb033812b765f1969eb962cf6_610x267.png)

> 系數通常不為0，應該是有理數
>
單項式的數字因數叫做單項式的系數
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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