当前位置:首页>文档>2025届高中数学一轮复习讲义:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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)

  • 2026-03-10 06:05:57 2026-03-10 06:05:57

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2025届高中数学一轮复习讲义:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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:第二章第1讲 不等式与不等关系(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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第二章 不等式 第1讲 不等式与不等关系 复习要点 1.掌握等式的性质.2.会比较两个数(式)的大小.3.理解不等式的性质,掌握不 等式性质的简单应用. 一 比较两个实数的大小 二 等式的性质 对称性:如果a=b,那么 b = a ; 传递性:如果a=b,b=c,那么 a = c ; 可加(减)性:如果a=b,那么a±c=b±c; 可乘性:如果a=b,那么ac=bc; 可除性:如果a=b,c≠0,那么 = . 三 不等式的性质 对称性:a>b b < a ; 传递性:a>b,b>c a > c ; ⇔ 可加性:a>b a+c>b+c; ⇒ 可乘性:a>b,c>0 ac > bc ;a>b,c<0 ac < bc ; ⇔ 同向可加性:a>b,c>d a + c > b + d ; ⇒ ⇒ 同向同正可乘性:a>b>0,c>d>0 ac > bd ; ⇒ 同正可乘方性:a>b>0 an>bn(n∈N,n≥2). ⇒ 常/用/结/论 ⇒ 1.a>b,ab>0 <. 2.a<0<b <. ⇒ 3.a>b>0,0<c<d >. ⇒ 4. 0 < a < x < b 或 a < x < b < 0 << . ⇒ 表现为函数y=在(-∞,0),(0,+∞)单调递减. ⇒ 5.若a>b>0,m>0,则 (1)<;>(b-m>0); 糖水加糖变甜,反映为函数y=(a>b>0)在(0,+∞)单调递增. 一些不等式成立,背 后常隐含函数的单调性. (2)>;<(b-m>0). 1.判断下列结论是否正确. (1)a>b,c>d a-d>b-c.(√) (2)a>b a3>b3.(√) ⇒ ⇒(3)a>b ac2>bc2.() (4)a>b,c>d ac>bd.() ⇔ (5)a>b <.() ⇒ 2.设a>b,a,b,c∈R,则下列式子正确的是( ) ⇒ A.ac2>bc2 B.>1 C.a-c>b-c D.a2>b2 解析:a>b,若c=0,则ac2=bc2,故A错误;a>b,若b<0,则<1,故B错误;a>b, 不论c取何值,都有a-c>b-c,故C正确;a>b,若a,b都小于0,则a2log 0.5=1, 0.2 0.2 0.2 0.5 0.5 所以c>1>a>>b,故选C. 答案:C 维度4 单调性法 典例5(2022·全国甲卷,文)已知9m=10, a = 10 m - 11 , b = 8 m - 9 ,则( ) 两代数式结构相同,应构造函数,自变量的选择也很关键,哪里变化,哪里为自变量. A.a>0>b B.a>b>0 C.b>a>0 D.b>0>a 解析:∵9m=10,∴m∈(1,2), 令f(x)=xm-(x+1),x∈(1,+∞), ∴f′(x)=mxm-1-1, ∵x>1且1<m<2,∴xm-1>1,∴f′(x)>0, ∴f(x)在(1,+∞)上单调递增, 又9m=10,∴9m-10=0,即f(9)=0, 又a=f(10),b=f(8), ∴f(8)<f(9)<f(10),即b<0<a.故选A. 利用单调性法比较大小 主要是指如何构造函数. 应用函数的单调性、对称性、周期性比较大小. (1)得到函数的单调区间是此类问题求解的关键,解题时,指数、对数、三角函数单调 性的运用是解题的主要形式. (2)通过对称性、周期性,可以将比较大小的数式转化到同一个单调区间,有利于其大 小比较. (3)导数工具的应用,拓宽了这类问题的命题形式和解题难度,值得我们关注和重视. 对点练5(1)(2023·天津卷)若a=1.010.5,b=1.010.6,c=0.60.5,则a,b,c的大小关系为 ( ) A.c>a>b B.c>b>a C.a>b>c D.b>a>c (2)已知M=,N=,则M,N的大小关系为________. 解析:(1)由y=1.01x在R上单调递增,得a=1.010.5c=0.60.5,所以b>a>c. 故选D. (2)方法一:M-N=- = = =>0. ∴M>N. 方法二:令f(x)= ==+, 显然f(x)是R上的减函数, ∴f(2 021)>f(2 022),即M>N. 答案:(1)D (2)M>N 题型 不等式的综合性问题 典例 6(1)若 0<x<1,a>0 且 a≠1,则|log (1-x)|与|log (1+x)|的大小关系是 a a ______________. (2)已知-1<x+y<4且2<x-y<3,则z=2x-3y的取值范围是________. 解析:(1)方法一(作差法):当a>1时,log (1-x)<0,log (1+x)>0, a a ∴|log (1-x)|-|log (1+x)|=-log (1-x)-log (1+x)= - log (1 - x 2 ) > 0 . a a a a a 底数,真数不在同一范围,则对数值为负.当0<a<1时,log (1-x)>0,log (1+x)<0, a a ∴|log (1-x)|-|log (1+x)|=log (1-x)+log (1+x)=log (1 - x 2 ) > 0 . a a a a a 底数a,真数(1-x2)都大于0小于1,则对数值为正. 综上,|log (1-x)|>|log (1+x)|. a a 方法二(作商法):∵= = |log (1 - x ) |, (1+x) 应用换底公式的变形. 又0<x<1,∴1+x>1,0<1-x<1, ∴|log (1 - x ) | =- log (1 - x ) = log = log = 1 - log (1 - x 2 ) , (1+x) (1+x) (1+x) (1+x) (1+x) 又 0 < 1 - x 2 < 1 , ∴ log (1 - x 2 ) < 0 , 1-log (1-x2)>1,即>1. (1+x) (1+x) 努力变形,构造出1-log (1-x2)的形式,再判别对数式和0的大小关系. (1+x) 于是|log (1-x)|>|log (1+x)|.故答案为|log (1-x)|>|log (1+x)|. a a a a (2)方法一:设 2 x - 3 y = λ ( x + y ) + μ ( x - y ) =(λ+μ)x+(λ-μ)y, 经典解法,用已知条件中的代数式,表示出目标式,求解参数. 对应系数相等,则⇒ ∴2x-3y=-(x+y)+(x-y)∈(3,8). 方法二:令∴ 此法省去了方法一中的方程组,妙! ∴2x-3y=2×-3×=-+b∈(3,8).故答案为(3,8). 利用不等式性质求代数式的取值范围 由a
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  1. CONNECT:[ UseTime:0.000769s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001275s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000582s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000538s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001087s ]
  6. SELECT * FROM `set` [ RunTime:0.000454s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001192s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370392 LIMIT 1 [ RunTime:0.000922s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370392 [ RunTime:0.005038s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093973 WHERE `id` = 370392 [ RunTime:0.000965s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370392 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000887s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370392 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000907s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370392 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001931s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370392 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001870s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370392 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001952s ]
0.168382s