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如何判断图象与x轴有几个交点
更新时间: 2020-09-16 00:00:00  

二次函数要看德尔塔与零的大小关系,令德尔塔等于0,解方程;如果无实根则无交点,若有有实根且实根为一个,则只有一个交点;若有两个实根,则有两个交点;三角函数看给定的区间决定交点的数量,否则有无数个交点。

关键词: 如何 判断 交点

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