已知函数f(x)=lg(ax²+3x+a)的定义域为R,求a的范围?
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![已知函数f(x)=lg(ax²+3x+a)的定义域为R,求a的范围?](/uploads/image/z/587010-66-0.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dlg%28ax%26%23178%3B%2B3x%2Ba%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BAR%2C%E6%B1%82a%E7%9A%84%E8%8C%83%E5%9B%B4%3F)
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