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                            ## 單項式

- [秒殺名師 初中數學七年級下冊 單項式](https://www.bilibili.com/video/BV1Gx411M7n2?from=search&seid=13230821715235130722)

![](https://img.kancloud.cn/c1/89/c189ca7e3ca2a0cb34318bc19bd853f5_682x477.png)

單項式是乘積, 前面的數字是系數. 后面的字母是次數

- `2a3`   系數為`2`, 次數為`3` 
- `2a3b`  系數為`2`, 次數為`4` (b=一個)

**練一練**

若`(a-1)x2y?`是關于x和y的五次單項式, 且系數為1, 求出`a`和`n`的結果;

(2-1)=12y3

- a => 2
- n => 3



## 多項式

- [秒殺名師 初中數學七年級上冊 多項式](https://www.bilibili.com/video/BV1Jx411M7Rt?from=search&seid=15744658322011651802)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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