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                            # 方程
含有`未知數`的`等式`

- 在古代, 未知數叫做`元`,  一個未知數就是`一元`
- 次數是取最高次數?  比如`3x2-1a` (x兩次, a一次,  就是x`兩次`),  兩個未知數, 就是`二元二次方程`




## 一元一次方程

**視頻**

- [初中數學七年級上冊 一元一次方程](https://www.bilibili.com/video/BV11x411j77v?from=search&seid=6382264983803081835)

## 方程組
同時滿足兩個方程的組合叫做`方程組`, 如圖所示

![](https://img.kancloud.cn/b9/87/b987c9f75f0ba9235cc85223e95d9fd3_366x160.png)



                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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