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2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第2章 §2.2 函数的单调性与最值_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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§2.2 函数的单调性与最值 考试要求 1.借助函数图象,会用数学符号语言表达函数的单调性、最值,理解实际意 义.2.掌握函数单调性的简单应用. 知识梳理 1.函数的单调性 (1)单调函数的定义 增函数 减函数 一般地,设函数f(x)的定义域为D,区间I⊆D,如果∀x,x∈I 1 2 定义 当x f ( x ),那么就 1 2 1 2 1 2 1 2 就称函数f(x)在区间I上单调递增 称函数f(x)在区间I上单调递减 图象 描述 自左向右看图象是上升的 自左向右看图象是下降的 (2)单调区间的定义 如果函数y=f(x)在区间I上单调递增或单调递减,那么就说函数y=f(x)在这一区间具有(严 格的)单调性,区间I叫做y=f(x)的单调区间. 2.函数的最值 前提 设函数y=f(x)的定义域为D,如果存在实数M满足 (1)∀x∈D,都有 f ( x ) ≤ M ; (1)∀x∈D,都有 f ( x ) ≥ M ; 条件 (2)∃x∈D,使得 f ( x ) = M (2)∃x∈D,使得 f ( x ) = M 0 0 0 0 结论 M为f(x)的最大值 M为f(x)的最小值 常用结论 1.∀x,x∈I且x≠x,有>0(<0)或(x-x)[f(x)-f(x)]>0(<0)⇔f(x)在区间I上单调递增(减). 1 2 1 2 1 2 1 2 2.在公共定义域内,增函数+增函数=增函数,减函数+减函数=减函数. 3.函数y=f(x)(f(x)>0或f(x)<0)在公共定义域内与y=-f(x),y=的单调性相反. 4.复合函数的单调性:同增异减. 思考辨析 判断下列结论是否正确(请在括号中打“√”或“×”)(1)因为f(-3)f 的x的取值范围是________. 答案 解析 ∵f(x)的定义域是[0,+∞), ∴2x-1≥0,即x≥, 又∵f(x)是定义在[0,+∞)上的减函数, ∴2x-1<,即x<, 则x的取值范围为. 题型一 确定函数的单调性 命题点1 函数单调性的判断 例1 (多选)下列函数在(0,+∞)上单调递增的是( ) A.y=ex-e-x B.y=|x2-2x| C.y=2x+2cos x D.y= 答案 AC 解析 ∵y=ex与y=-e-x为R上的增函数, ∴y=ex-e-x为R上的增函数,故A正确; 由y=|x2-2x|的图象(图略)知,B不正确;对于选项C,y′=2-2sin x≥0, ∴y=2x+2cos x在(0,+∞)上单调递增,故C正确; y=的定义域为(-∞,-2]∪[1,+∞),故D不正确. 命题点2 利用定义证明函数的单调性 例2 试讨论函数f(x)=(a≠0)在(-1,1)上的单调性. 解 方法一 设-10,x-1<0,x-1<0, 2 1 1 2 故当a>0时,f(x)-f(x)>0,即f(x)>f(x),函数f(x)在(-1,1)上单调递减; 1 2 1 2 当a<0时,f(x)-f(x)<0,即f(x)0时,f′(x)<0,函数f(x)在(-1,1)上单调递减; 当a<0时,f′(x)>0,函数f(x)在(-1,1)上单调递增. 思维升华 确定函数单调性的四种方法 (1)定义法;(2)导数法;(3)图象法;(4)性质法. 跟踪训练1 (1)函数g(x)=x·|x-1|+1的单调递减区间为( ) A. B. C.[1,+∞) D.∪[1,+∞) 答案 B 解析 g(x)=x·|x-1|+1=画出函数图象,如图所示, 根据图象知,函数的单调递减区间为. (2)函数f(x)= 的单调递增区间是( ) A.[-1,+∞) B.(-∞,-1) C.(-∞,0) D.(0,+∞) 答案 B 解析 f(x)= 分解为y=2u和u=-x2-2x两个函数,y=2u在R上单调递增, u=-x2-2x=-(x+1)2+1在(-∞,-1)上单调递增,在[-1,+∞)上单调递减,根据复合函数单调性得到函数f(x)= 在(-∞,-1)上单调递增. 题型二 函数单调性的应用 命题点1 比较函数值的大小 例3 (2023·成都模拟)已知函数f(x)为R上的偶函数,对任意x ,x∈(-∞,0),均有(x - 1 2 1 x 2 )[f(x 1 )-f(x 2 )]<0成立,若a=f(ln ),b= ,c= ,则a,b,c的大小关系是( ) A.c3,则a的取值范围是________. 2 答案 (0,1) 解析 由f(x)=x-log (x+2)知, 2f(x)在定义域(-2,+∞)上是减函数, 且f(-1)=3, 由f(a-2)>3,得f(a-2)>f(-1), ∴ 解得0f(b)>f(c) B.f(b)>f(a)>f(c) C.f(a)>f(c)>f(b)D.f(c)>f(a)>f(b) 答案 A 解析 因为y=ex是增函数,y=e-x是减函数, 所以f(x)=ex-e-x在(0,+∞)上单调递增,且f(x)>0. 又f(x)=-x2在(-∞,0]上单调递增,且f(x)≤0, 所以f(x)在R上单调递增. 又c=log 0.9<0,01, 2 3 即a>b>c,所以f(a)>f(b)>f(c). 5.(多选)已知函数f(x)=则下列结论正确的是( ) A.f(x)在R上为增函数 B.f(e)>f(2) C.若f(x)在(a,a+1)上单调递增,则a≤-1或a≥0 D.当x∈[-1,1]时,f(x)的值域为[1,2] 答案 BC 解析 易知f(x)在(-∞,0],(0,+∞)上单调递增,A错误,B正确; 若f(x)在(a,a+1)上单调递增, 则a≥0或a+1≤0, 即a≤-1或a≥0,故C正确; 当x∈[-1,0]时,f(x)∈[1,2], 当x∈(0,1]时,f(x)∈(-∞,2], 故当x∈[-1,1]时,f(x)∈(-∞,2],故D错误. 6.(多选)已知函数f(x)=x-(a≠0),下列说法正确的是( ) A.当a>0时,f(x)在定义域上单调递增 B.当a=-4时,f(x)的单调递增区间为(-∞,-2),(2,+∞) C.当a=-4时,f(x)的值域为(-∞,-4]∪[4,+∞) D.当a>0时,f(x)的值域为R 答案 BCD 解析 当a>0时,f(x)=x-, 定义域为(-∞,0)∪(0,+∞). ∵f(x)在(-∞,0),(0,+∞)上单调递增,故A错误; 又当x→-∞时,f(x)→-∞, 当x→0-时,f(x)→+∞, ∴f(x)的值域为R,故D正确; 当a=-4时,f(x)=x+,由其图象(图略)可知,B,C正确. 7.函数f(x)=x2-6|x|+8的单调递减区间是________. 答案 (-∞,-3],[0,3] 解析 由题意得函数f(x)= 当x≥0时,函数f(x)=x2-6x+8的单调递减区间为[0,3], 当x<0时,函数f(x)=x2+6x+8的单调递减区间为(-∞,-3], 综上,函数f(x)=的单调递减区间为(-∞,-3],[0,3]. 8.已知命题p:“若f(x)0, +1>0. ∴f(x)-f(x)<0,即f(x)1,ax-2>0,因此解得a≥2, 所以实数a的取值范围为[2,+∞). 12.设函数f(x)=x2 022-+5,则f(x)的单调递增区间为________,不等式f(x-1)<5的解集为 ________. 答案 (0,+∞) (0,1)∪(1,2) 解析 由题意得f(x)的定义域为(-∞,0)∪(0,+∞).因为f(x)=f(-x),所以f(x)是偶函数. 当x>0时,f(x)=x2 022-+5,f(x)单调递增,因此当x<0时,f(x)单调递减.又因为f(1)=f(- 1)=5,所以由f(x-1)<5可得-1-1,则下列说法正确的 1 2 1 2 是( ) A.y=f(x)+x是增函数 B.y=f(x)+x是减函数 C.y=f(x)是增函数 D.y=f(x)是减函数 答案 A 解析 不妨令x-1⇔f(x)-f(x)<-(x-x)⇔f(x)+xb>c B.b>c>a C.c>b>a D.a>c>b 答案 D 解析 ∵a=ln 3>ln e=1,b=lg 5b,a>c, ∵lg 5==,log 6==, 12 ∴构造函数f(x)==1-(x>0), 显然函数f(x)在(0,+∞)上单调递增, 又∵0c>b.
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  1. CONNECT:[ UseTime:0.000596s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000905s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000265s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000607s ]
  6. SELECT * FROM `set` [ RunTime:0.000243s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000750s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369699 LIMIT 1 [ RunTime:0.000797s ]
  9. UPDATE `wendang` SET `liulancishu` = 2 WHERE `id` = 369699 [ RunTime:0.000826s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090567 WHERE `id` = 369699 [ RunTime:0.000724s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369699 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000543s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369699 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000572s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369699 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002500s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369699 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001590s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369699 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005061s ]
0.086694s