设，若函数在区间上有三个零点，则实数的取值范围是

设，若函数在区间上有三个零点，则实数的取值范围是 .

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设 ，若函数 在区间上有三个零点，则实数的取值范围是

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设，若函数在区间上有三个零点，则实数的取值范围是