解方程；2x平方+6x-1=0
什么方法都行，只要解出就可以了
人气：483 ℃ 时间：2020-01-31 08:08:15
解答
由求根公式得：
x=[-6±√(6²-4*2*(-1)]/(2*2)
=(-3±√11)/2
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