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2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)

  • 2026-03-10 06:34:56 2026-03-10 06:34:56

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2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)
2025年高考数学一轮复习-拓展拔高3-用构造法解决函数问题导学案_2.2025数学总复习_2025年新高考资料_一轮复习_2025年高考数学一轮复习-拓展拔高(课件+导学案)

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拓展拔高 3 用构造法解决函数问题 【高考考情】函数中的构造问题是高考考查的一个热点内容,既可能在选择、填 空题中运用,也可能在解答题中出现. 【解题关键】通过已知等式或不等式的结构特征,构造新函数,解决比较大小、 解不等式、恒成立等问题. 视角一 通过变量构造具体函数 [例1](1)若0ln x 2 -ln x 1 B.ex 2 -ex 1 x 1 ex 2 D.x 2 ex 1 x >0, 2 1 所以ex 1>ex 2,即x >x . 2ex 1 1ex 2 x x 1 2 1 1 (2)(2023·石家庄模拟)若ln x-ln y< - (x>1,y>1),则( ) lnx ln y A.ey-x>1 B.ey-x<1 C.ey-x-1>1 D.ey-x-1<1 1 1 【解析】选A.依题意,ln x- 0, t2 所以f(t)在(-∞,0),(0,+∞)上单调递增; 又x>1,y>1,得ln x>0,ln y>0, 因为f(ln x)0, 所以ey-x>e0=1,A正确,B不正确; 又无法确定y-x-1与0的大小关系,故C,D不正确. 思维升华 若题目所给的条件含有两个变量,可通过变形使两个变量分别置于等号或不等号 两边,即可构造函数,并且利用函数的单调性求解.视角二 利用导数的运算法则构造函数 微切口1 利用f(x)与xn构造函数 [例 2]设 f(x)是定义在 R 上的偶函数,且 f(1)=0,当 x<0 时,有 xf'(x)-f(x)>0 恒成立,则 不等式f(x)>0的解集为________. f (x) 【解析】构造F(x)= , x f '(x)·x-f (x) 则F'(x)= , x2 当x<0时,xf'(x)-f(x)>0,可以推出 当x<0时,F'(x)>0,F(x)在(-∞,0)上单调递增. 因为f(x)为偶函数,所以F(x)为奇函数, 所以F(x)在(0,+∞)上也单调递增. 根据f(1)=0可得F(1)=0,根据函数的单调性、奇偶性可得函数图象(图略),根据图 象可知f(x)>0的解集为(-∞,-1)∪(1,+∞). 答案:(-∞,-1)∪(1,+∞) 思维升华 (1)出现nf(x)+xf'(x)形式,构造函数F(x)=xnf(x); f (x) (2)出现xf'(x)-nf(x)形式,构造函数F(x)= . xn 微切口2 利用f(x)与ex构造函数[例3](2023·南昌模拟)已知定义在 R上的函数 f(x)满足 f(x)+f'(x)>0,且有 f(3)=3,则 f(x)>3e3-x的解集为________. 【解析】设F(x)=f(x)·ex, 则F'(x)=f'(x)·ex+f(x)·ex=ex[f(x)+f'(x)]>0, 所以F(x)在R上单调递增. 又f(3)=3,则F(3)=f(3)·e3=3e3. 因为f(x)>3e3-x等价于f(x)·ex>3e3, 即F(x)>F(3), 所以x>3,即所求不等式的解集为(3,+∞). 答案:(3,+∞) 思维升华 (1)出现f'(x)+nf(x)形式,构造函数F(x)=enxf(x); f (x) (2)出现f'(x)-nf(x)形式,构造函数F(x)= . enx 迁移应用 已知可导函数 f(x)的导函数为 f'(x),若对任意的 x∈R,都有 f'(x)-f(x)<1,且 f(0)=2 022,则不等式f(x)+1>2 023ex的解集为( ) A.(-∞,0) B.(0,+∞)1 C. .(-∞, ) D.(-∞,1) e f (x)+1 【解析】选A.构造函数F(x)= , ex 则F'(x)=f '(x)·ex-[f (x)+1]·ex=f '(x)-f (x)-1, e2x ex 因为f'(x)-f(x)<1, 所以F'(x)<0恒成立, f (x)+1 f (x)+1 故F(x)= 在R上单调递减,f(x)+1>2 023ex可变形为 >2 023, ex ex f (0)+1 又f(0)=2 022,所以F(0)= =2 023, e0 所以F(x)>F(0),解得x<0. 微切口3 利用f(x)与sin x,cos x构造函数 π [例 4](多选题)已知定义在(0, )上的函数 f(x),f'(x)是 f(x)的导函数,且恒有 f'(x)sin 2 x-f(x)cos x<0成立,则( ) π π π π A. f( )>√2f ( ) B.√2f ( )>f ( ) 6 4 6 3 π π π π C.√3f ( )>f( ) D.√2f( )>f( ) 6 3 6 4 f (x) π 【解析】选CD.令g(x)= ,x∈(0, ), sinx 2 f '(x)sinx-f (x)cosx 则g'(x)= , sin2x π 又由x∈(0, ),且恒有f'(x)sin x-f(x)cos x<0, 2 π 则有g'(x)<0,即函数g(x)在(0, )上单调递减. 2π π π π 由 < ,则有g( )>g( ), 6 3 6 3 π π f( ) f( ) 6 3 π π 即 > ,可得√3f( )>f( ); π π 6 3 sin sin 6 3 π π π π 又由 < ,则有g( )>g( ), 6 4 6 4 π π f( ) f( ) 6 4 π π 即 > ,可得√2f( )>f( ). π π 6 4 sin sin 6 4 思维升华 函数f(x)与sin x,cos x相结合构造可导函数的几种常见形式: F(x)=f(x)sin x,F'(x)=f'(x)sin x+f(x)cos x; f (x) f '(x)sinx-f (x)cosx F(x)= ,F'(x)= ; sinx sin2x F(x)=f(x)cos x,F'(x)=f'(x)cos x-f(x)sin x; f (x) f '(x)cosx+f (x)sinx F(x)= ,F'(x)= . cosx cos2x 迁移应用 π π π 已知偶函数 f(x)的定义域为(- , ),其导函数为 f'(x),当 0 , 所以 3 π π -
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  1. CONNECT:[ UseTime:0.000399s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000655s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000282s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000281s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000616s ]
  6. SELECT * FROM `set` [ RunTime:0.008970s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000772s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370679 LIMIT 1 [ RunTime:0.000457s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370679 [ RunTime:0.016513s ]
  10. UPDATE `wendang` SET `lasttime` = 1773095715 WHERE `id` = 370679 [ RunTime:0.002657s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370679 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005453s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370679 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000589s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370679 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001383s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370679 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005003s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370679 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009137s ]
0.123727s