当前位置:首页>南京>拆解2026年1月江苏省盐城市、南京市高三期末考第19题函数、导数与三角函数融合的综合题

拆解2026年1月江苏省盐城市、南京市高三期末考第19题函数、导数与三角函数融合的综合题

  • 2026-05-01 04:02:00
拆解2026年1月江苏省盐城市、南京市高三期末考第19题函数、导数与三角函数融合的综合题

拆解2026年1月江苏省盐城市、南京市高三期末考第19题

函数、导数与三角函数融合的综合题

题破数学

哈喽各位同学~这道题是 2026 年 1 月江苏省盐城市、南京市高三期末第 20 题,属于函数、导数与三角函数融合的综合题 —— 高三期末函数导数类压轴题。它深度整合 “导数求切线方程、构造函数证明不等式、利用函数性质与放缩法证明数列型不等式” 三大核心考点,精准对标高考导数题 “导数工具 + 函数性态分析 + 不等式放缩” 的命题逻辑,对 “导数运算精准度”“构造函数的思维能力”“放缩法与三角函数有界性的结合” 要求较高,是检验高三学生函数导数模块综合应用能力的典型试题!

据考后数据与教研分析:

  • 难度评级:★★★★☆(高考 5 星标准,阶段考实测平均耗时 12-15 分钟)

  • 梯度差异:

    1. 第 (1) 问:低难度基础题,聚焦 “导数求切线方程”,核心是导数的准确计算、切点处函数值与导数值的求解,以及点斜式方程的应用;属于必争分内容。

    2.第 (2) 问 :中等难度题,重点考查 “构造函数证明不等式”,核心是将待证不等式化简,构造新函数并利用导数分析其单调性、最值,对构造函数的思路与导数工具的应用熟练度要求高。

    3.第 (3) 问 :高档难度题,综合考查 “利用函数性质与放缩法证明数列型不等式”,涉及导数、三角函数、指数函数的综合分析,对放缩法的选择、函数零点性质的挖掘以及不等式变形能力要求极高,是本次期末的核心区分点。

典型失分场景:

①第 (1)问:导数计算失误,或忽略切点同时在曲线和切线上的条件,导致求解出错;

②第 (2)问:对 “任意 - 存在” 型不等式的转化逻辑理解不清,无法正确转化为函数最值问题,或构造新函数后求导失误,导致最值分析错误;

③第 (3) 问:构造辅助函数的思路卡顿,或对新函数求导后无法准确分析其单调性,导致不等式证明逻辑不完整,期末实测该问得分率仅 25%,部分学生因前两问耗时过长,未完整作答此问。

1

原题呈现

2

逐问拆解

(1)导数几何意义之切线方程求解(基础题)

核心:求导代点写切线

我们先求出函数的导函数,代入横坐标计算出切线斜率,再求出该点的函数值得到切点坐标,最后用点斜式写出切线方程并整理为一般式。

 (2)构造函数法证明不等式恒成立

核心:构造函数证最值

我们先将待证不等式整理为新函数大于等于零的形式,对新函数求导并分析其在区间内的符号,确定新函数的单调性,进而求出其在区间端点或极值点处的最值,若最值非负则不等式得证。

(3)函数零点性质与放缩法证明不等式

核心:放缩代换证不等式

我们先利用零点定义将方程转化为三角等式,再结合第二问的不等式结论进行放缩变形,通过三角恒等变换和指数函数的单调性化简不等式,最终得到要证明的结论。

3

题型总结

(1)子题型拆解

  • 第 (1) 问:导数几何意义之切线方程求解题型

    考查核心:导数的四则运算(指数函数、三角函数的复合求导)、导数的几何意义(切点处导数值即为切线斜率),重点考查 “导数运算精准度与几何意义的转化逻辑”(通过求导得到切线斜率,结合切点坐标利用点斜式确定切线方程)。

    常用方法:导数四则运算法(ex、sinx、cosx 的求导公式及乘积法则)、切点坐标求解法(代入x=0求函数值)、点斜式方程法(y−y0=k(x−x0))。

  • 第 (2) 问:构造函数法证明不等式恒成立题型

    考查核心:导函数的化简变形、构造新函数的思维能力、利用导数分析函数单调性与最值的逻辑,重点考查 “不等式恒成立与函数最值的转化逻辑”(将待证不等式变形后构造函数,通过求导确定函数最值,以最值符号证明不等式)。

    常用方法:构造差函数法(将不等式移项构造 h(x)=f(x)+g(x)−φ(x))、导数符号分析法(分析新函数导函数的正负确定单调性)、函数最值定位法(利用单调性确定区间内最值)。

  • 第 (3) 问:函数零点性质与放缩法证明不等式题型

    考查核心:函数零点的定义与性质、指数函数与三角函数的放缩技巧、导数结论的迁移应用能力,重点考查 “多模块融合下的不等式证明逻辑”(结合零点条件、前问结论与放缩法,完成含参数 n 的数列型不等式证明)。

    常用方法:零点定义转化法(将 f(xn)=1 转化为等量关系)、结论迁移法(利用第 (2) 问结论进行放缩)、三角与指数放缩法(结合三角函数有界性、指数函数单调性简化不等式)。

(2)整体综合题型

  • 这类题属于 “指数函数、三角函数与导数的深度融合型压轴题”,这类题型的特点是:以 ex(sinx+cosx) 这一经典指数三角复合函数为载体,通过导数工具串联 “切线方程求解→区间不等式证明→零点相关数列型不等式证明” 三大核心考点,前两问的结论(切线方程、函数最值)与分析方法(构造函数、导数分析单调性)为第 (3) 问的放缩证明提供直接支撑,是高考中 “导数工具 + 函数性态分析 + 不等式放缩” 模块分层递进考查的典型题型。

  • 这类题的命题逻辑是 “由易到难、分层考查”:

    基础层(第 (1) 问):聚焦导数工具的基础应用,考查导数运算与几何意义的单一转化,为后续问题奠定运算与结论基础;

    进阶层(第 (2)问):深化构造函数与导数的综合应用,考查区间内函数最值的分析能力,搭建起 “基础运算” 到 “综合证明” 的桥梁;

    拔高层(第 (3)问):综合函数零点、不等式放缩与前问结论,考查知识迁移与逻辑推理的高阶能力,形成 “导数运算→单调性分析→最值应用→放缩证明” 的完整考查链条。

  • 先把函数和导函数的表达式写对,尤其是指数乘三角的求导法则,别漏乘、错乘,这是后续所有步骤的根基。

  • 证明不等式时,先把式子整理干净,看清区间范围,构造新函数后一定要先判断导数符号,再谈单调性,别凭感觉下结论。

  • 第三问别硬算,要主动联想前两问的结论和方法,尤其是第二问的不等式,往往是第三问放缩的关键跳板,别把各小问割裂开看。

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  1. CONNECT:[ UseTime:0.000572s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000785s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000594s ]
  6. SELECT * FROM `set` [ RunTime:0.000214s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000687s ]
  8. SELECT * FROM `article` WHERE `id` = 490654 LIMIT 1 [ RunTime:0.001404s ]
  9. UPDATE `article` SET `lasttime` = 1777931790 WHERE `id` = 490654 [ RunTime:0.001060s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000302s ]
  11. SELECT * FROM `article` WHERE `id` < 490654 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000598s ]
  12. SELECT * FROM `article` WHERE `id` > 490654 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000422s ]
  13. SELECT * FROM `article` WHERE `id` < 490654 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001541s ]
  14. SELECT * FROM `article` WHERE `id` < 490654 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002790s ]
  15. SELECT * FROM `article` WHERE `id` < 490654 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001049s ]
0.163839s