当前位置:首页>文档>2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)

2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)

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2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)
2025届高中数学一轮复习讲义:第三章第6讲 对数函数(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_2025届高中数学一轮复习知识梳理(课件+讲义+练习)(完结)

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第6讲 对数函数 复习要点 1.通过具体实例,了解对数函数的概念.能画出具体对数函数的图象,探 索并了解对数函数的单调性与特殊点.2.知道对数函数y=log x与指数函数y=ax(a>0,且 a a≠1)互为反函数. 1.对数函数的图象与性质 a>1 0b>c B.b>a>c C.c>b>a D.c>a>b 解析:∵a=50.1>50=1,b=log 3=log >0且b=log 0,解得x<-1或x>3,根据复合函数的单 调性,可得函数f(x)的单调递增区间为(3,+∞). 答案:(3,+∞) 题型 对数函数图象的应用与探究 典例1(1)当 0< x ≤ 时, 4 x 4,解得a>,∴1时,直线y=-x+a与 当a≤1时,直线y=-x+a与两段函数都有交点,不合题意. y=log x只有一个交点,即方程f(x)+x-a=0只有一个实根.故答案为(1,+∞). 2 利用对数函数的图象可求解的两类热点问题 (1)对一些可通过平移、对称变换作出其图象的对数型函数,在求解其单调性(单调区 间)、值域(最值)、零点时,常利用数形结合思想求解. (2)一些对数型方程、不等式问题常转化为相应的函数图象问题,利用数形结合法求解. 对点练1(1)(多选)已知函数f(x)=log (x-b)(a>0,且a≠1)的图象如图所示,则以下说法 a 正确的是( ) A.-10 C.01,故C错误;令f(x)=log (x- ab)=0,即x=b+1,所以函数f(x)的零点为b+1,结合函数图象可知00,故B正确;因为0<|b|<1,所以log |b|b>c B.a>c>b C.b>a>c D.c>a>b (2)设a,b,c均为正数,且 2 a = log a , b = log b , c = log c,则( ) 2 \f(1,2 \f(1,2 三组方程,都是指数函数和对数函数的交点,结合数形结合法,思考交点的位置. A.alog 0.3=1,所以 0.5 0.3 0.3 bb>c B.c>a>b C.c>b>a D.b>c>a (2)(2024·广东广州调研)设x ,x ,x 均为实数,且e-x =ln x ,e-x =ln(x +1),e-x 1 2 3 1 1 2 2 3 =lg x,则( ) 3 A.x2=2,所以a>b,因为f(x)=log x,g(x)=log x单调递 2 3 2 3 增,所以c=log π+log π>log 3+log 2,所以c>a.故选B. 2 3 2 3 (2)画出函数y=x,y=ln x,y=ln(x+1),y=lg x的图象,如图所示. 数形结合,知x1 ,所以 x = . 故答案为 x=. 对数方程、对数不等式,不可忽略真数大于0的限制条件. (2)由题意知,① 或② 解不等式组①得f(log 8)的解集为________. 3 解析:(1)当x≤1时,由21-x≤2,得1-x≤1,∴0≤x≤1;当x>1时,由1-log x≤2,得 2 x≥,∴x>1.综上,x的取值范围为[0,+∞).故选D. (2)因为函数f(x)是定义在R上的偶函数,且在(-∞,0]上单调递减,所以函数f(x)在 (0,+∞)上单调递增,将f(log (2x-5))>f(log 8)化为|log (2x-5)|>|log 8|,即log (2x 3 3 3 \f(1,3 \f(1,3 -5)>log 8或log (2x-5)<-log 8=log ,即2x-5>8或0<2x-5<,解得x>或0 ,得 x >3 或 x <1 . 先求定义域,在定义域内思考复合函数的单调区间. 故函数的定义域为(-∞,1)∪(3,+∞). 令g(x)=x2-4x+3, 则g(x)在(-∞,1)上单调递减,在(3,+∞)上单调递增. 又y=log x在定义域上单调递减, \f(1,2 所以f(x)的单调递增区间是(-∞,1),单调递减区间是(3,+∞). (2)不存在.理由如下: 令h(x)=x2-2ax+3, 要使 f ( x ) 在 ( -∞, 2) 上单调递增,应使 h ( x ) 在 ( -∞, 2) 上单调递 减,且恒大于 0 . 此两个条件,转化为关于a的两个不等式. 因此即此不等式组无解. 所以不存在实数a,使f(x)在(-∞,2)上单调递增. 求解对数型复合函数的单调性问题时,要注意在定义域的基础上,弄清楚复合函数的 构成,即它是由哪些基本初等函数复合而成的,然后依据复合函数的单调性规律确定该函数的单调性. 对点练4(多选)(2024·湖南湘潭模拟)已知函数f(x)=ln x,a>0,则下列结论中正确的是( ) A.函数y=f(a+x)-f(x)是其定义域上的减函数 B.函数y=f(a-x)+f(-x)是其定义域上的减函数 C.函数y=f(a-x)+f(a+x)是其定义域上的增函数 D.函数y=f(a+x)-f(a-x)是其定义域上的增函数 解析:对于A,因为函数y=f(a+x)-f(x)的定义域为(0,+∞),函数y=f(a+x)-f(x) =ln在(0,+∞)上单调递减,所以A正确;对于B,因为函数y=f(a-x)+f(-x)的定义域 为(-∞,0),函数y=f(a-x)和y=f(-x)在(-∞,0)上单调递减,所以函数y=f(a-x)+ f(-x)在(-∞,0)上单调递减,所以B正确;对于C,因为函数y=f(a-x)+f(a+x)的定义 域为(-a,a),函数y=ln(a2-x2)是偶函数,所以函数y=f(a-x)+f(a+x)在(-a,a)上不可 能是单调函数,所以C错误;对于D,因为函数y=f(a+x)-f(a-x)的定义域为(-a,a), 函数y=f(a+x)和y=-f(a-x)在(-a,a)上单调递增,所以函数y=f(a+x)-f(a-x)在(- a,a)上为增函数,所以D正确.故选ABD. 答案:ABD 维度4 对数函数性质的综合问题 典例5已知函数f(x)=log [(m2 -1)x2+(m+1)x+1]. \f(1,2 (1)若m=0,求f(x)的单调区间; (2)若f(x)的定义域为R,求实数m的取值范围; (3)若 f ( x ) 的值域为 R ,求实数m的取值范围. 转化为真数值域包含(0,+∞)的一切实数,因此满足三个条件:①开口向上;②二次 函数与x轴有交点;③特殊情形,m=1时,真数为一条直线,值域包含(0,+∞). 解:(1)当m=0时,f(x)=log (-x2+x+1), \f(1,2 设真数u(x)=-x2+x+1, 且要满足u(x)=-x2+x+1>0, 即0 对一切实数 x 恒成 立. 不等式恒成立求参数,由参数出现的位置,展开对参数的讨论.①当m2-1=0,即m=±1时, 若m=1,u(x)=2x+1,显然,只有x>-时,才有u(x)>0,不符合题意,∴m≠1; 若m=-1,则u(x)=1>0对一切实数x都成立,∴ m =- 1 满足题意 . 此特殊情形,即二次项系数为0,应重视. ②当m2-1≠0时,u(x)>0对一切实数x恒成立的充要条件是 开口向上,二次函数与x轴无交点. 即解得m<-1或m>. 综上,实数m的取值范围是(-∞,-1]∪. (3)要使f(x)的值域为R,只需真数u(x)=(m2-1)x2+(m+1)x+1的值域包含(0,+∞). ① 当 m 2 - 1 = 0 ,即m=±1时,若m=1,则u(x)=2x+1, 二次项系数为零的特殊情形. 显然u(x)的值域包含(0,+∞), ∴m=1满足题意; 若m=-1,则u(x)=1,不符合题意,∴m≠-1. ②当m2-1≠0时, 必有 开口向上,与x轴有交点,才满足值域包含(0,+∞). 即解得10,解得x>或x<-,∴f(x)的定义域为∪,又f(-x)=ln =ln =ln -1=-ln =-f(x),∴f(x)为奇函数,故A正确,B错误;又f(x)=ln =ln,令t=1+,t>0 且t≠1,∴f(x)=ln t,又t=1+在上单调递减,且y=ln x为增函数,∴f(x)在上单调递减, 故C正确;易知f(x)的值域是(-∞,0)∪(0,+∞),故D正确. 答案:ACD
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  1. CONNECT:[ UseTime:0.000514s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000810s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000319s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000741s ]
  6. SELECT * FROM `set` [ RunTime:0.000234s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000568s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370352 LIMIT 1 [ RunTime:0.002119s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370352 [ RunTime:0.004220s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093813 WHERE `id` = 370352 [ RunTime:0.000697s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370352 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370352 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000445s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370352 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001878s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370352 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007156s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370352 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013192s ]
0.115514s