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2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)

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2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高5-指对同构导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)

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拓展拔高 5 指对同构 【高考考情】同构思想,在高考中有非常强烈的体现,不管是小题还是大题,都处 在压轴题的位置,备受命题者的青睐,它能够很好地考查学生的数学建模、数学 抽象、数学运算的核心素养. 【同构法】是证明不等式的一种技巧,通过等价变形使得两边的式子结构相同, 从而将两边看成是同一个函数的两个函数值,借助该函数的单调性简化不等式, 使问题得以解决.同构法需要有敏锐的观察能力才能找到函数的模型. 一、五个常见变形 ex x ①xex=ex+ln x ② =ex-ln x ③ =eln x-x x ex ex ④x+ln x=ln(xex) ⑤x-ln x=ln x 二、三种基本类型视角一 bln b与xex同构 [导思]bln b=eln b·ln b,即ln b·eln b对应xex模型,可构造函数f(x)=xex.lnx [例1]设实数λ>0,若对于任意的 x∈(0,+∞),不等式eλx- ≥0恒成立,则λ的最小值 λ 为( ) 1 1 2 A.eB. C. D. 2e e e lnx 【解析】选C.由eλx- ≥0,得λeλx-ln x≥0, λ 即λxeλx-xln x≥0,也即λxeλx≥xln x. 由同构xln x=eln x·ln x, 可得(λx)·eλx≥ln x·eln x. 设f(x)=xex, 则f'(x)=(x+1)ex>0对x∈(0,+∞)恒成立, 所以f(x)在(0,+∞)上单调递增. 由(λx)·eλx≥ln x·eln x可得f(λx)≥f(ln x), 即λx≥ln x,也即λ≥lnx,所以λ≥(lnx) . x x max lnx 1-lnx 令g(x)= (x>0),则g'(x)= (x>0). x x2 所以当x∈(0,e)时,g'(x)>0,g(x)单调递增; 当x∈(e,+∞)时,g'(x)<0,g(x)单调递减. 1 1 因此,g(x) =g(e)= ,故λ≥ . max e e 视角二 aea与xln x同构[导思]aea=ea·ln ea,即ea·ln ea对应xln x模型,可构造函数f(x)=xln x. [例2]已知函数f(x)=aex-1-ln x+ln a,若f(x)≥1,则a的取值范围为________. 【解析】由f(x)≥1,得aex-1-ln x+ln a≥1. ex 1 ex 变形后可化为aex-1≥ln ex-1≥ ln a a a ⇔ e ex ex ex ex ex ex≥ ln xex≥ ln exln ex≥ ln . a a a a a a ⇔ ⇔ ⇔ 1 令g(x)=xln x(x>0),则g'(x)=1+ln x,可知当x∈(0, )时,g'(x)<0,g(x)单调递减; e 1 当x∈( ,+∞)时,g'(x)>0,g(x)单调递增. e ex 所以原不等式等价于g(ex)≥g( ),且x>0, a ex ex>1, >0. a 所以g(ex)≥g(ex) ex≥ex a≥(ex) . a a ex max ⇔ ⇒ ex e(1-x) 令h(x)= (x>0),则h'(x)= . ex ex 所以当x∈(0,1)时,h'(x)>0,h(x)单调递增; 当x∈(1,+∞)时,h'(x)<0,h(x)单调递减. 所以h(x) =h(1)=1, max 故a的取值范围是[1,+∞). 答案:[1,+∞) a lnx 视角三 与 同构 ea x[导思] a =ln ea,即ln ea对应lnx模型,可构造函数f(x)=lnx. ea ea ea x x [例3]已知a>0,且x2+xln a-aexln x>0对任意的x∈(0,1)恒成立,则实数a的取值范 围为______________. 【解析】因为x2+xln a-aexln x>0, 所以aexln x0, 所以f(x)在(0,1)上单调递增, 所以x∈(0,1)时,f(x)<0. 因为lnx 恒成立,令 g(x)= ,则 g'(x)= >0,即 g(x)在(0,1)上单调递增,故 a≥g(1)= ex ex ex 1 1 ,实数a的取值范围是[ ,+∞). e e 1 答案: [ ,+∞) e视角四 c+ln c与x+ex同构 [导思]c+ln c=eln c+ln c,即ln c+eln c对应x+ex模型,可构造函数f(x)=x+ex. [例4]已知函数f(x)=ex+2ax(x∈R), (1)求f(x)的单调性; 【解析】(1)f'(x)=ex+2a. 当a≥0时,f(x)在(-∞,+∞)上单调递增. 当a<0时,f(x)在(-∞,ln (-2a))上单调递减,在(ln (-2a),+∞)上单调递增. (2)a>0,令g(x)=f(x)-a(x-1)ln (ax-a)+a,若g(x)恒单调递增,求a的取值范围. 【解析】(2)g(x)=ex+2ax-a(x-1)ln (ax-a)+a的定义域为(1,+∞).因为g(x)恒单调递增, ex 所以 g'(x)=ex-aln (ax-a)+a≥0 在(1,+∞)上恒成立,即 ≥ln a(x-1)-1,也即 ex-ln a-ln a a≥ln (x-1)-1,整理得 ex-ln a+(x-ln a)≥eln (x-1)+ln (x-1).令 F(x)=ex+x,显然 F(x)在(1,+∞) 上单调递增,原不等式等价于 F(x-ln a)≥F(ln (x-1)),所以 x-ln a≥ln (x-1),即ln a≤x- ln (x-1). 1 x-2 令 h(x)=x-ln (x-1)(x>1),则 h'(x)=1- = (x>1).所以 h(x)在(1,2)上单调递减,在 x-1 x-1 (2,+∞)上单调递增,h(x) =h(2)=2. min 因此,ln a≤2,即a≤e2,a的取值范围是(0,e2]. 思维升华指对同构解题的关键点 (1)常用的指对同构:指数和对数混合的导数题,直接使用同构的题目并不多,许 多情况下,需要凑出同构的形式来.因为指数和对数之间可以互相转换,所以尽量 ea b 转换为常见的aea≤bln b, = ,ea±a>b±ln b三种同构形式. a lnb (2)复杂式的指对同构:比如aeax≤ln x两边同乘 x可转化为 axeax≤xln x;ax>log x可 a lnx 1 转化为exln a> ,两边再同时乘 xln a可转化为(xln a)·exln a>xln x;x+ ≥xa-ln xa可 lna ex 1 1 转化为 -ln ≥xa-ln xa等. ex ex
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  1. CONNECT:[ UseTime:0.000950s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001384s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010770s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000600s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001577s ]
  6. SELECT * FROM `set` [ RunTime:0.003049s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001561s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370682 LIMIT 1 [ RunTime:0.004424s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370682 [ RunTime:0.015485s ]
  10. UPDATE `wendang` SET `lasttime` = 1773095735 WHERE `id` = 370682 [ RunTime:0.007219s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370682 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001118s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370682 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001055s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370682 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003108s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370682 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003282s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370682 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014214s ]
0.233516s