问题
填空题
已知函数
其中m>0，若存在实数b，使得关于x的方程f（x）=b有三个不同的根，则m的取值范围是（）。
答案
参考答案：（3，+∞）
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已知函数其中m>0，若存在实数b，使得关于x的方程f（x）=b有三个不同的根，则m的取值范围是（）。
参考答案：（3，+∞）
| 完形填空。 |
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