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高三一轮复习- 函数零点问题专题

  • 2026-09-24 15:13:46

高三一轮复习- 函数零点问题专题

高三一轮复习三角函数，零点题别被绕晕。近六年全国卷考了12道真题，剥掉外衣就三件事。

一是数方程根的个数；二是把“有且仅有n个零点”翻译成周期覆盖不等式；三是把图象翻译成求ω和φ。读图求参考得最多，12题里占了3道。

解题就五招：解方程、联立交点、周期估范围、平移求对称、读图定参。每招精练两三题，就能堵住拉分点。

最容易栽的坑就四处：端点取不取等号、忘数半周期多算少算一个、平移方向搞反、把相邻零点距当周期。把这些封死，读图题就能零失误。


需要word文档请点击链接：高三一轮复习-函数零点问题专题_例题与练习题.docx
高三一轮复习-函数零点问题专题_例题与练习题.docx

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