当前位置:首页>文档>2025届高中数学一轮复习讲义:第三章第5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数(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5讲 指数函数 复习要点 1.通过具体实例,了解指数函数的实际意义,理解指数函数的概念.2.能画 出具体指数函数的图象,探索并理解指数函数的单调性与特殊点. 指数函数及其性质 1.指数函数的概念 函数 y = a x ( a >0 ,且 a ≠1) 叫做指数函数,其中指数x是自变量,函数的定义域是R,a 是底数. [说明] 形如y=kax,y=ax+k(k∈R且k≠0,a>0且a≠1)的函数叫做指数型函数. 2.指数函数的图象和性质 底数 a>1 00时,恒有y>1; 当x>0时,恒有01 函数在定义域R上为增函数 函数在定义域R上为减函数 常/用/结/论 1.画指数函数y=ax(a>0,且a≠1)的图象,应抓住三个关键点:(1,a),(0,1),. 2.指数函数的图象与底数大小的比较 如图是指数函数(1)y=ax,(2)y=bx,(3)y=cx,(4)y=dx的图象,底数a,b,c,d与1 之间的大小关系为c>d>1>a>b>0. 在第一象限内,指数函数 y = a x ( a >0 ,且 a ≠1) 的图象越高 , 底数越大. 所谓“底大图高”,反映指数函数的排列规律. 1.判断下列结论是否正确. (1)函数y=a-x(a>0,且a≠1)是R上的增函数.() (2)函数y=ax(a>0,且a≠1)与x轴有且只有一个交点.() (3)若am>an,则m>n.()(4)函数y=ax与y=a-x(a>0,且a≠1)的图象关于y轴对称.(√) 2.定义运算a⊕b=则函数f(x)=1⊕2x的图象是( ) 解析:因为当x<0时,2x<1;当x≥0时,2x≥1.所以f(x)=1⊕2x=故选A. 答案:A 3.已知a=,b=,c=,则a,b,c的大小关系是________. 解析:∵y=x是R上的减函数,∴>>0,即a>b>1,又c=<0=1,∴c1,b<0 B.a>1,b>0 C.00 D.00,且a≠1)的图象,应抓住三个关键点:(1,a),(0,1),. (2)与指数函数有关的函数图象的研究,往往利用相应指数函数的图象,通过平移、对 称变换得到其图象. 对点练1(1)(2024·安徽合肥模拟)函数①y=ax;②y=bx;③y=cx;④y=dx的图象如图 所示,a,b,c,d分别是下列四个数:,,,中的一个,则a,b,c,d的值分别是( ) A.,,, B.,,, C.,,, D.,,, (2)(多选)已知非零实数a,b满足3a=2b,则下列不等关系中正确的是( ) A.a>>,故选C. (2)如图,由指数函数的图象可知,0b>c B.a>c>b C.b>c>a D.c>b>a 解析:方法一:由指数函数y=0.3x在定义域内单调递减,得ab. 方法二:因为 = 0.3 < 1 ,且 = 0. 5 <1 ,又a,b,c都为正数,所以c>b>a,故选D. 方法二为商值比较法. 比较指数式大小的方法 比较两个指数式的大小时,尽量化成同底或同指. (1)当底数相同,指数不同时,构造同一指数函数,然后利用指数函数的性质比较大小. (2)当指数相同,底数不同时,构造两个指数函数,利用图象比较大小;或构造同一幂 函数,然后利用幂函数的性质比较大小. (3)当底数不同,指数也不同时,常借助1,0等中间量进行比较. 对点练2已知a=,b=,c=,则( ) A.a ,即c1时,等式不成立.故a的值为.故答案为. 1.解指数方程的依据 af(x)=ag(x)(a>0,且a≠1) f(x)=g(x). 2.解指数不等式的思路方法 ⇔对于形如ax>ab(a>0,且a≠1)的不等式,需借助函数y=ax的单调性求解,如果a的 取值不确定,则需分a>1与0<a<1两种情况讨论;而对于形如ax>b的不等式,需先将 b转化为以a为底的指数幂的形式,再借助函数y=ax的单调性求解. 对点练3(多选)(2024·重庆质检)若4x-4y<5-x-5-y,则下列关系式正确的是( ) A.xx-3 C.> D.y<3-x 解析:由4x-4y<5-x-5-y,得4x-5-x<4y-5-y,令f(x)=4x-5-x,则f(x)y-3,故B错 误;当x<0,y<0时,,无意义,故C错误;因为y=x在R上是减函数,且x0 ,又y=t2-8t+17=(t-4)2+1在(0,4]上单调递减, 内层函数单调递减. 在(4,+∞)上单调递增. 令 x ≤4 ,得 x ≥ - 2 ,令x>4,得x<-2, 代入外层函数的单调递减区间,得到自变量 x的取值范围,这才是复合函数的单调递 增区间. 而函数t=x在R上单调递减,所以函数y=2x-8·x+17的单调递增区间为[-2,+∞). 求解与指数函数有关的复合函数问题时,首先要熟知指数函数的定义域、值域、单调 性等相关性质,其次要明确复合函数的构成,当涉及单调性问题时,要借助“同增异减”这一性质分析判断. 对点练4(1)(2024·山东莱芜模拟)已知函数f(x)=若函数g(x)=f(x)-t(t∈R)有3个不同的 零点a,b,c,则2a+2b+2c的取值范围是( ) A.[16,32] B.[16,34) C.(18,32] D.(18,34) (2)已知函数f(x)=(a为常数,且a≠0,a∈R),且f(x)是奇函数. ①求a的值; ②若∀x∈[1,2],都有f(2x)-mf(x)≥0成立,求实数m的取值范围. (1)解析:函数g(x)=f(x)-t(t∈R)有3个不同的零点,即y=f(x)与y=t有三个不同的交 点,画出函数f(x)的大致图象如图,令a
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  1. CONNECT:[ UseTime:0.000810s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001508s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000646s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000698s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001349s ]
  6. SELECT * FROM `set` [ RunTime:0.005467s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001410s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370349 LIMIT 1 [ RunTime:0.006045s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370349 [ RunTime:0.005409s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093780 WHERE `id` = 370349 [ RunTime:0.001083s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370349 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001018s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370349 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000945s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370349 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002678s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370349 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002377s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370349 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011552s ]
0.206218s