解方程:①![](https://img.xkw.com/dksih/QBM/2015/1/19/1573787624071168/1573787629846528/STEM/68bc000610bc41a7afa312e750a428ac.png)
②
(需用配方法解)
![](https://img.xkw.com/dksih/QBM/2015/1/19/1573787624071168/1573787629846528/STEM/68bc000610bc41a7afa312e750a428ac.png)
②
![](https://img.xkw.com/dksih/QBM/2015/1/19/1573787624071168/1573787629846528/STEM/7482bc59509549398af2bd755869b99d.png)
更新时间:2016-12-05 22:22:02
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【推荐1】已知关于x的一元二次方程ax2+bx+1=0中,b=
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