教材或资料会出现这样的题目:把方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/0.png)
x
2-x=2化为一元二次方程的一般形式,并写出它的二次项系数、一次项系数和常数项.
现在把上面的题目改编为下面的两个小题,请解答.
(1)下列式子中,有哪几个是方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/1.png)
x
2-x=2所化的一元二次方程的一般形式?(答案只写序号)
①
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/2.png)
x
2-x-2=0;②-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/3.png)
x
2+x+2=0;③x
2-2x=4;④-x
2+2x+4=0;⑤
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/4.png)
x
2-2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/5.png)
x-4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/6.png)
=0.
(2)方程
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103102505356131676/SYS201311031025053561316014_ST/7.png)
x
2-x=2化为一元二次方程的一般形式,它的二次项系数,一次项系数,常数项之间具有什么关系?
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