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2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)
2024年高考数学一轮复习(新高考版)第3章 必刷小题5 导数及其应用_2.2025数学总复习_2024年新高考资料_1.2024一轮复习_2024年高考数学一轮复习讲义(新高考版)

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必刷小题 5 导数及其应用 一、单项选择题 1.函数f(x)=(2x-1)ex的单调递增区间为( ) A. B. C. D. 答案 C 解析 因为函数f(x)=(2x-1)ex,所以f′(x)=2ex+(2x-1)ex=(2x+1)ex, 令f′(x)>0,解得x>-, 所以函数f(x)的单调递增区间为. 2.(2023·茂名模拟)若曲线y=f(x)=x2+ax+b在点(1,f(1))处的切线为3x-y-2=0,则有( ) A.a=-1,b=1 B.a=1,b=-1 C.a=-2,b=1 D.a=2,b=-1 答案 B 解析 将x=1代入3x-y-2=0得y=1,则f(1)=1, 则1+a+b=1,① ∵f(x)=x2+ax+b, ∴f′(x)=2x+a,则f′(1)=3,即2+a=3,② 联立①②,解得a=1,b=-1. 3.已知x=0是函数f(x)=eax-ln(x+a)的极值点,则a等于( ) A.1 B.2 C.e D.±1 答案 A 解析 因为f(x)=eax-ln(x+a), 所以f′(x)=aeax-. 又x=0是f(x)的极值点, 所以a-=0, 解得a=±1,经检验知a=-1不符合条件,故a=1. 4.(2023·济南质检)拉格朗日中值定理是微分学中的基本定理之一,定理内容是:如果函数 f(x)在闭区间[a,b]上的图象连续不间断,在开区间(a,b)内的导数为f′(x),那么在区间 (a,b)内至少存在一点c,使得f(b)-f(a)=f′(c)(b-a)成立,其中c叫做f(x)在[a,b]上的 “拉格朗日中值点”.根据这个定理,可得函数f(x)=x3-3x在[-2,2]上的“拉格朗日中值 点”的个数为( ) A.3 B.2 C.1 D.0答案 B 解析 函数f(x)=x3-3x, 则f(2)=2,f(-2)=-2,f′(x)=3x2-3, 由f(2)-f(-2)=f′(c)(2+2), 得f′(c)=1,即3c2-3=1, 解得c=±∈[-2,2], 所以f(x)在[-2,2]上的“拉格朗日中值点”的个数为2. 5.(2023·潍坊模拟)已知函数f(x)=xex-x2-2x-m在(0,+∞)上有零点,则m的取值范围 是( ) A.[1-ln22,+∞) B.[-ln22-1,+∞) C.[-ln22,+∞) D. 答案 C 解析 由函数y=f(x)在(0,+∞)上存在零点可知,m=xex-x2-2x(x>0)有解, 设h(x)=xex-x2-2x(x>0), 则h′(x)=(x+1)(ex-2)(x>0), 当0ln 2时,h′(x)>0,h(x)单调递增. 则x=ln 2时,h(x)取得最小值,且h(ln 2)=-ln22, 所以m的取值范围是[-ln22,+∞). 6.已知a,b∈R,则“ln a>ln b”是“a+sin b>b+sin a”的( ) A.充分不必要条件 B.必要不充分条件 C.充要条件 D.既不充分也不必要条件 答案 A 解析 由ln a>ln b,得a>b>0. 由a+sin b>b+sin a, 得a-sin a>b-sin b. 记函数f(x)=x-sin x(x∈R), 则f′(x)=1-cos x≥0, 所以函数f(x)在R上单调递增, 又a-sin a>b-sin b, 则f(a)>f(b),所以a>b. 因此“ln a>ln b”是“a+sin b>b+sin a”的充分不必要条件. 7.(2023·宁波模拟)设m≠0 ,若x=m为函数f(x)=m·(x-m)2(x-n)的极小值点,则( ) A.m>n B.m1 答案 C 解析 f′(x)=m[2(x-m)(x-n)+(x-m)2]=3m(x-m), 若m<0,则f′(x) 是开口向下的抛物线,若x=m是极小值点, 必有m<,则n>m,即<1; 若m>0 ,f′(x) 是开口向上的抛物线,若x=m是极小值点, 必有m>,则n0,得x>4ln 2;令h′(x)<0,得x<4ln 2, 所以h(x)在(-∞,4ln 2)上单调递减,在(4ln 2,+∞)上单调递增,h(x) =7-8ln 2, min 所以当x=4ln 2时,x-x 取最小值,为7-8ln 2. 2 1 二、多项选择题 9.下列函数中,存在极值点的是( ) A.y=x+ B.y=2x2-x+1 C.y=xln x D.y=-2x3-x 答案 ABC 解析 由题意,对于A,函数y=x+,y′=1-,可得函数y=x+在(-∞,-1),(1,+ ∞)上单调递增,在(-1,0),(0,1)上单调递减,所以函数有两个极值点x=-1和x=1; 对于B,函数y=2x2-x+1为开口向上的抛物线,一定存在极值点,即为顶点的横坐标 x =; 对于 C,函数 y=xln x,y′=ln x+1,当 x∈时,y′<0,函数单调递减,当 x∈时, y′>0,函数单调递增,所以函数y=xln x在x=处取得极小值; 对于D,函数y=-2x3-x,y′=-6x2-1<0,所以函数y=-2x3-x在R上单调递减,没 有极值点. 10.已知函数f(x)=e2-x+x,x∈[1,3],则下列说法正确的是( ) A.函数f(x)的最小值为3B.函数f(x)的最大值为3+ C.函数f(x)的最小值为e+1 D.函数f(x)的最大值为e+1 答案 AD 解析 ∵f(x)=e2-x+x,x∈[1,3], ∴f′(x)=-e2-x+1, 令f′(x)>0,解得x>2;令f′(x)<0,解得x<2, 故函数f(x)在区间[1,2]上单调递减,在区间[2,3]上单调递增, 所以函数f(x)在x=2处取得极小值,也是最小值,为f(2)=3, 而f(1)=e+1,f(3)=3+,则f(1)>f(3), 故f(x)的最大值为f(1)=e+1. 11.函数f(x)=ax3-bx2+cx的图象如图,且f(x)在x=x 与x=1处取得极值,给出下列判断, 0 其中正确的是( ) A.c<0 B.a<0 C.f(1)+f(-1)>0 D.函数y=f′(x)在(0,+∞)上单调递减 答案 AC 解析 f′(x)=3ax2-2bx+c=3a(x-x)(x-1), 0 由图知x>1时,f(x)单调递增,可知f′(x)>0,所以a>0,故B错误; 又f′(x)=3ax2-2bx+c=3a(x-x)(x-1)=3ax2-3a(1+x)x+3ax, 0 0 0 ∴2b=3a(1+x),c=3ax,∵x<-1<0∴c=3ax<0, 故A正确; 0 0 0 0 ∵x<-1<0,∴1+x<0,∴f(1)+f(-1)=-2b=-3a(1+x)>0,故C正确; 0 0 0 f′(x)=3ax2-2bx+c,其图象开口向上,对称轴小于 0,函数f′(x)在(0,+∞)上单调递增, 故D错误. 12.(2022·南通模拟)定义:在区间I上,若函数y=f(x)是减函数,且y=xf(x)是增函数,则 称y=f(x)在区间I上是“弱减函数”.根据定义,下列结论正确的是( ) A.f(x)=在(0,+∞)上是“弱减函数” B.f(x)=在(1,2)上是“弱减函数” C.若f(x)=在(m,+∞)上是“弱减函数”,则m≥eD.若f(x)=cos x+kx2在上是“弱减函数”,则≤k≤ 答案 BCD 解析 对于A,f(x)=在(0,+∞)上单调递减,y=xf(x)=1不单调,故A错误; 对于B,f(x)=,f′(x)=,在(1,2)上f′(x)<0,函数f(x)单调递减, y=xf(x)=,y′==>0在x∈(1,2)上恒成立, ∴y=xf(x)在(1,2)上单调递增,故B正确; 对于C,若f(x)=在(m,+∞)上单调递减, 由f′(x)==0,得x=e, ∴m≥e,y=xf(x)=ln x在(m,+∞)上单调递增,故C正确; 对于D,f(x)=cos x+kx2在上单调递减, f′(x)=-sin x+2kx≤0在x∈上恒成立⇒2k≤ , min 令h(x)=,h′(x)=,令φ(x)=xcos x-sin x, φ′(x)=cos x-xsin x-cos x=-xsin x<0,x∈, ∴φ(x)在上单调递减,φ(x)<φ(0)=0, ∴h′(x)<0,∴h(x)在上单调递减,h(x)>h=, ∴2k≤⇒k≤, 令g(x)=xf(x)=xcos x+kx3,则g(x)在上单调递增, g′(x)=cos x-xsin x+3kx2≥0在x∈上恒成立, ∴3k≥ , max 令F(x)=,F′(x)=>0,x∈, ∴F(x)在上单调递增,F(x)0,当x∈时,f′(x)<0, ∴f(x) =f =2-ln 3, max 综上可知,f(x) =2-ln 3. max 15.(2023·南京模拟)写出一个同时具有下列三条性质的三次函数f(x)=________. ①f(x)为奇函数;②f(x)存在3个不同的零点;③f(x)在(1,+∞)上单调递增. 答案 x3-3x(答案不唯一) 解析 f(x)=x3-3x,f(x)为奇函数,f(x)有三个零点0,±, f′(x)=3x2-3,当x>1时,f′(x)>0,即f(x)在(1,+∞)上单调递增, ①②③都满足,∴f(x)=x3-3x满足题意. 16.(2022·郑州质检)已知过点P(a,1)可以作曲线y=ln x的两条切线,则实数a的取值范围 是________. 答案 (0,e) 解析 设曲线y=ln x与其切线交于A(x,y), 0 0 切线方程l:y=kx+b,y′=, 由导数与切线方程斜率关系可得k=y′| =,① 又∵切线过点P(a,1), ∵要保证过点P(a,1)可以作曲线y=ln x的两条切线,可得P(a,1)不能在曲线y=ln x上, ∴x≠a, 0 ∴k=,② ∵点A在曲线y=ln x上,故y=ln x,③ 0 0 由①②③式可得=⇒=, ∴x(ln x-1)=x-a,解得a=2x-x·ln x, 0 0 0 0 0 0 令f(x)=2x-x·ln x, 则f′(x)=2-x·-ln x=1-ln x, 令f′(x)=0,故1-ln x=0, ∴x=e, 当x∈(0,e)时,f′(x)>0,f(x)单调递增; 当x∈(e,+∞)时,f′(x)<0,f(x)单调递减, 即f(x)在x=e处取得最大值,故f(x) =f(e)=2e-e·ln e=e, max 作出f(x)的草图如图所示,由图可知a仅在(0,e)范围内有2个对应的x值, 即a∈(0,e)时,有2个解,此时存在2条切线方程, 综上所述,a的取值范围为(0,e).
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  1. CONNECT:[ UseTime:0.000908s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001590s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000768s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000732s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001278s ]
  6. SELECT * FROM `set` [ RunTime:0.000613s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001527s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369743 LIMIT 1 [ RunTime:0.017660s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369743 [ RunTime:0.015243s ]
  10. UPDATE `wendang` SET `lasttime` = 1773090471 WHERE `id` = 369743 [ RunTime:0.001434s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369743 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001309s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369743 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001182s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369743 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002457s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369743 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003044s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369743 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025886s ]
0.171919s