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求不等式中参数的范围是中学数学的难点之一．我们在解题实践中发现,利用函数最值求不等式中参数的范围,思路清晰,过程简捷．现举例说明如下,供参考．
Finding the range of parameters in inequality is one of the difficulties in mathematics in middle school. We found in the problem-solving practice that the use of the function value to find the range of parameters in the inequality, the thinking is clear, the process is simple and fast. An example is illustrated below for reference.