(2+m)(X的平方)+6mX+4m+1=0 只有一个实数根,求m的值和此时方程的根.
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![(2+m)(X的平方)+6mX+4m+1=0 只有一个实数根,求m的值和此时方程的根.](/uploads/image/z/569324-20-4.jpg?t=%EF%BC%882%2Bm%29%EF%BC%88X%E7%9A%84%E5%B9%B3%E6%96%B9%EF%BC%89%2B6mX%2B4m%2B1%3D0+%E5%8F%AA%E6%9C%89%E4%B8%80%E4%B8%AA%E5%AE%9E%E6%95%B0%E6%A0%B9%2C%E6%B1%82m%E7%9A%84%E5%80%BC%E5%92%8C%E6%AD%A4%E6%97%B6%E6%96%B9%E7%A8%8B%E7%9A%84%E6%A0%B9.)
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