下列方程:①3x2+1=0;②
x2﹣
x+1=0;③2x﹣
=1;④x2﹣2xy=5;⑤
=1;⑥ax2+bx+c=0其中是一元二次方程的个数( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95fcfaf750395f9e5b843f017aab25d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a918e74d03fef8e26524df8abff328.png)
A.2 | B.3 | C.4 | D.5 |
更新时间:2018-12-19 13:28:01
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