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2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)

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2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)
2025届高中数学一轮复习练习:第三章限时跟踪检测(八) 函数的单调性和最值(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第三章第2讲函数的单调性和最值(课件+讲义+练习)

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限时跟踪检测(八) 函数的单调性和最值 一、单项选择题 1.函数f(x)=在( ) A.(-∞,1)∪(1,+∞)上是增函数 B.(-∞,1)∪(1,+∞)上是减函数 C.(-∞,1)和(1,+∞)上是增函数 D.(-∞,1)和(1,+∞)上是减函数 2.(2024·山东潍坊统考)下列函数中,在区间(-1,1)上单调递减的是( ) A.y= B.y=cos x C.y=ln(x+1) D.y=2-x 3.函数f(x)=( ) A.在(-1,+∞)上单调递增 B.在(1,+∞)上单调递增 C.在(-1,+∞)上单调递减 D.在(1,+∞)上单调递减 4.(2024·湖北华大新联盟考试)若函数f(x)=2|x-a|+3在区间[1,+∞)上不单调,则 实数a的取值范围是( ) A.[1,+∞) B.(1,+∞) C.(-∞,1) D.(-∞,1] 5.(2024·山东济宁模拟)设函数f(x)定义在实数集上,它的图象关于直线x=1对称,且 当x≥1时,f(x)=3x-1,则( ) A.ff(x),则实数x的取值范围是( ) A.(-∞,-1)∪(2,+∞) B.(-∞,-2)∪(1,+∞) C.(-1,2) D.(-2,1) 8.(2024·湖北八校联考)设函数f(x)=若函数y=f(x)在区间(a,a+1)上单调递增,则实 数a的取值范围是( ) A.(-∞,1]B.[1,4] C.[4,+∞) D.(-∞,1]∪[4,+∞) 二、多项选择题 9.设函数f(x)在R上为增函数,则下列结论错误的是( ) A.y=在R上为减函数 B.y=|f(x)|在R上为增函数 C.y=-在R上为增函数 D.y=-f(x)在R上为减函数 10.已知函数f(x)=x-(a≠0),则下列说法正确的是( ) 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 三、填空题与解答题 11.已知函数f(x)=e|x-a|(a为常数),若f(x)在区间[1,+∞)上单调递增,则实数a的取 值范围是________. 12.(2024·福建漳州月考)对任意的实数x∈R都有f(sin x)=-cos 2x+cos2x+2sin x- 3,则f(x)的值域为________. 13.已知函数y=log (6-ax+x2)在区间[1,2]上单调递增,则实数a的取值范围是 \f(1,2 ________. 14.(2024·河北石家庄模拟)已知f(x)的定义域为R,对任意x,y∈R都有f(x+y)=f(x) +f(y)-2,且当x>0时,f(x)<2. (1)试判断f(x)的单调性,并证明; (2)若f(-1)=3,解不等式f(2x2-3x)+f(x)>3. 高分推荐题 15.(2024·贵州贵阳模拟)若a=ln 3,b=lg 5,c=log 6,则( ) 12 A.a>b>c B.b>c>a C.c>b>a D.a>c>b 解析版 一、单项选择题 1.函数f(x)=在( ) A.(-∞,1)∪(1,+∞)上是增函数B.(-∞,1)∪(1,+∞)上是减函数 C.(-∞,1)和(1,+∞)上是增函数 D.(-∞,1)和(1,+∞)上是减函数 解析:函数f(x)的定义域为{x|x≠1}.f(x)==-1,根据函数y=-的单调性及有关性质, 可知f(x)在(-∞,1)和(1,+∞)上是增函数. 答案:C 2.(2024·山东潍坊统考)下列函数中,在区间(-1,1)上单调递减的是( ) A.y= B.y=cos x C.y=ln(x+1) D.y=2-x 解析:函数y=,y=ln(x+1)在(-1,1)上都单调递增,函数y=cos x在(-1,0)上单调递 增,在(0,1)上单调递减,而函数y=2-x=x在(-1,1)上单调递减.故选D. 答案:D 3.函数f(x)=( ) A.在(-1,+∞)上单调递增 B.在(1,+∞)上单调递增 C.在(-1,+∞)上单调递减 D.在(1,+∞)上单调递减 解析:由题意知,f(x)=1-,∴f(x)的图象可由y=-的图象沿x轴向右平移一个单位 长度,再向上平移一个单位长度得到,如图所示,则 f(x)在(-∞,1)和(1,+∞)上都单调 递增. 答案:B 4.(2024·湖北华大新联盟考试)若函数f(x)=2|x-a|+3在区间[1,+∞)上不单调,则 实数a的取值范围是( ) A.[1,+∞) B.(1,+∞) C.(-∞,1) D.(-∞,1] 解析:易知函数f(x)=2|x-a|+3的增区间为[a,+∞),减区间为(-∞,a].因为函数 f(x)=2|x-a|+3在区间[1,+∞)上不单调,则a>1.故选B. 答案:B 5.(2024·山东济宁模拟)设函数f(x)定义在实数集上,它的图象关于直线x=1对称,且 当x≥1时,f(x)=3x-1,则( ) A.ff>f, 即f>f>f. 答案:B 6.已知函数f(x)=ex+e-x,则( ) A.f(-)0时,f′(x)=ex->0.所以函数f(x)在(0,+∞)上单调递增.因为<f(x),则实数x的取值范围是( ) A.(-∞,-1)∪(2,+∞) B.(-∞,-2)∪(1,+∞) C.(-1,2) D.(-2,1) 解析:因为当x=0时,两个表达式对应的函数值都为0,所以函数的图象是一条连续 的曲线.因为当x≤0时,函数f(x)=x3为增函数,当x>0时,f(x)=ln(x+1)也是增函数,所 以函数f(x)是定义在R上的增函数.因此,不等式f(2-x2)>f(x)等价于2-x2>x,即x2+x -2<0,解得-2<x<1.故选D. 答案:D 8.(2024·湖北八校联考)设函数f(x)=若函数y=f(x)在区间(a,a+1)上单调递增,则实 数a的取值范围是( ) A.(-∞,1] B.[1,4] C.[4,+∞) D.(-∞,1]∪[4,+∞) 解析:画出函数f(x)=的图象如图中实线部分所示, 由图可知函数f(x)=的单调递增区间为(-∞,2),(4,+∞),∵函数在(a,a+1)上单 调递增,∴a+1≤2或a≥4,∴a≤1或a≥4.答案:D 二、多项选择题 9.设函数f(x)在R上为增函数,则下列结论错误的是( ) A.y=在R上为减函数 B.y=|f(x)|在R上为增函数 C.y=-在R上为增函数 D.y=-f(x)在R上为减函数 解析:对于A,若f(x)=x,则y==,在R上不是减函数,错误; 对于B,若f(x)=x,则y=|f(x)|=|x|,在R上不是增函数,错误; 对于C,若f(x)=x,则y=-=-,在R上不是增函数,错误; 对于 D,函数 f(x)在 R 上为增函数,则对于任意的 x ,x∈R,设 x0,则y=-f(x)在R 1 2 1 2 1 2 2 1 上为减函数,正确.故选ABC. 答案:ABC 10.已知函数f(x)=x-(a≠0),则下列说法正确的是( ) 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 解析:f(x)=x-的定义域为(-∞,0)∪(0,+∞).当a>0时,f(x)在(-∞,0),(0,+ ∞)上都单调递增,但在整个定义域上不是单调递增的,故 A错误;当a>0,x→-∞时, f(x)→-∞,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. 答案:BCD 三、填空题与解答题 11.已知函数f(x)=e|x-a|(a为常数),若f(x)在区间[1,+∞)上单调递增,则实数a的取 值范围是________. 解析:f(x)= 当x≥a时,f(x)单调递增, 当x0在[1,2]上恒成立. ∴解得4≤a<5, ∴实数a的取值范围是[4,5). 答案:[4,5) 14.(2024·河北石家庄模拟)已知f(x)的定义域为R,对任意x,y∈R都有f(x+y)=f(x) +f(y)-2,且当x>0时,f(x)<2. (1)试判断f(x)的单调性,并证明; (2)若f(-1)=3,解不等式f(2x2-3x)+f(x)>3. 解:(1)f(x)是R上的减函数.证明如下:任取x,x∈R,x0,∴f(x-x)<2, 2 1 2 1 ∴f(x)3,即f(2x2- 2x)>f(1), ∴2x2-2x<1,解得b>c B.b>c>a C.c>b>a D.a>c>b 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.答案:D
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  1. CONNECT:[ UseTime:0.001044s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001478s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001471s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000707s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001347s ]
  6. SELECT * FROM `set` [ RunTime:0.000639s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001469s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370192 LIMIT 1 [ RunTime:0.001087s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370192 [ RunTime:0.001725s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093032 WHERE `id` = 370192 [ RunTime:0.001062s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370192 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001203s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370192 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000969s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370192 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004447s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370192 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003308s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370192 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010649s ]
0.132716s