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                            # 代數式
![](https://img.kancloud.cn/ea/f5/eaf55e4aea01ab88a81b62f516867d20_1170x576.png)
![](https://img.kancloud.cn/79/a0/79a00cf7a77f6aed713c23dfe5786b41_554x273.png)

`代數式`=字母代替數字的式子
- 不能出現`×`號,  比如`3×a`是錯的, 用`3·a`或者`3a`替代
- 不能出現除號, 比如`a÷3`是錯的, 用`三分之A`替代,`y分之a`替代
- 數字在前面,  `a3`這種寫法是錯誤的
- 不能寫代分數

**代數式求值**

![](https://img.kancloud.cn/35/2b/352bc378e95b7436d8f2e7321b7e6ed1_651x351.png)


## 代數式的分類

![](https://img.kancloud.cn/72/0e/720ef8657585cbd123fff6e52d5d0377_673x309.png)




# 視頻學習

- [初一知識點：代數式](https://www.bilibili.com/video/BV15x411r7bY?from=search&seid=912969270798181650)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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