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为什么当遇到偶函数的单调性求参数的取值时都要加绝对值
为什么当遇到偶函数的单调性求参数的取值时都要加绝对值
2025-03-30 11:14:28
推荐回答（1个）
回答1：
偶函数是关于y轴对称，左右的情况基本一样，加上绝对值会减掉好多麻烦，不用分情况左右讨论了
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