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2025届高中数学一轮复习练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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2025届高中数学一轮复习练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(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练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(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练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(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练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(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练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(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练习:第三章限时跟踪检测(十) 幂函数与指、对数式的运算(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习

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限时跟踪检测(十) 幂函数与指、对数式的运算 一、单项选择题 1.已知常数α∈Q,如图为幂函数y=xα的图象,则α的值可以为( ) A. B. C.- D.- 2 2.已知函数f(x)=(m2-m-5)xm -6是幂函数,对任意x ,x∈(0,+∞),且x≠x ,满 1 2 1 2 足>0,若a,b∈R,且a+b>0,则f(a)+f(b)的值( ) A.恒大于0 B.恒小于0 C.等于0 D.无法判断 3.下列运算正确的是( ) A.2log 10+log 0.25=2 \f(1,5 \f(1,5 B.log 27×log 8×log 5= 4 25 9 C.2lg 2-lg =1 D.log (2-)-(log )2=- 2 (2+ 4.(2024·山东潍坊模拟)已知a=,b=,c=log π,则a,b,c的大小关系为( ) 3 A.a>b>c B.a>c>b C.c>a>b D.c>b>a 5.已知e-e=2,则e-e的值为( ) A.2 B.8 C.10 D.14 6.(2024·河南新乡检测)已知lg a,lg b是方程6x2-4x-3=0的两根,则2=( ) A. B. C. D. 7.(2024·四川成都模拟)国家速滑馆又称“冰丝带”,是北京2022年冬奥会的标志性 场馆,拥有亚洲最大的全冰面设计,但整个系统的碳排放接近于零,做到真正的智慧场馆 绿色场馆,并且为了倡导绿色可循环的理念,场馆还配备了先进的污水、雨水过滤系统. 已知过滤过程中废水的污染物数量N(mg/L)与时间t的关系为N=N e-kt(N 为最初污染物数 0 0 量).如果前4小时消除了20%的污染物,那么污染物消除至最初的64%还需要的时间为( ) A.3.6小时 B.3.8小时 C.4小时 D.4.2小时 8.(2024·河南新乡模拟)已知lg 3=a,lg 5=b,则log 12的值为( ) 2 A. B.C. D. 9. 幂函数y=xα,当α取不同的正数时,在区间[0,1]上它们的图象是一组美丽的曲线 (如图),设点A(1,0),B(0,1),连接AB,线段AB恰好被其中的两个幂函数y=xa,y=xb的 图象三等分,即有BM=MN=NA,那么a-=( ) A.0 B.1 C. D.2 二、多项选择题 10.下列关系中,根式与分数指数幂的互化正确的是( ) A.-=(-x)(x>0) B.=y(y>0) C.xy=(x>0,y>0) D.x=-(x>0) 11.若10a=4,10b=25,则( ) A.a+b=2 B.b-a=1 C.ab>8(lg 2)2 D.b-a>lg 6 三、填空题与解答题 12.(2024·山西模拟)已知函数f(x)=x2-m是定义在区间[-3-m,m2-m]上的奇函数, 则f(m)=________. 13.(1)设5x=4,5y=2,则52x-y=________. (2)若100a=5,10b=2,则2a+b=________. 14.计算:(1)log 35+2log -log -log 14; 5 5 5 \f(1,2 (2). 高分推荐题 15.(1)若a4+a3+a2+a+1=0(a∈C),则a100=________. (2)(2024·湖北武汉质检)设的整数部分为x,小数部分为y,求x2+xy+的值.解析版 一、单项选择题 1.已知常数α∈Q,如图为幂函数y=xα的图象,则α的值可以为( ) A. B. C.- D.- 解析:由幂函数y=xα的图象关于y轴对称知,函数y=xα是偶函数,排除B,D选项; 再根据幂函数y=xα的图象在第一象限内从左到右下降,可得α<0,排除A选项.故选C. 答案:C 2 2.已知函数f(x)=(m2-m-5)xm -6是幂函数,对任意x ,x∈(0,+∞),且x≠x ,满 1 2 1 2 足>0,若a,b∈R,且a+b>0,则f(a)+f(b)的值( ) A.恒大于0 B.恒小于0 C.等于0 D.无法判断 2 解析:∵函数f(x)=(m2-m-5)x m -6是幂函数,∴m2-m-5=1,解得m=-2或m= 3.∵对任意x ,x∈(0,+∞),且x≠x ,满足>0,∴函数f(x)在(0,+∞)上单调递增,∴m2 1 2 1 2 -6>0,∴m=3,∴f(x)=x3.若a,b∈R,且a+b>0,则a>-b,∴f(a)>f(-b)=-f(b), ∴f(a)+f(b)>0.故选A. 答案:A 3.下列运算正确的是( ) A.2log 10+log 0.25=2 \f(1,5 \f(1,5 B.log 27×log 8×log 5= 4 25 9 C.2lg 2-lg =1 D.log (2-)-(log )2=- 2 (2+ 解析:对于D,log (2-)-(log )2=log -2=-1-=-,故D正确. 2 (2+ (2+ 答案:D 4.(2024·山东潍坊模拟)已知a=,b=,c=log π,则a,b,c的大小关系为( ) 3 A.a>b>c B.a>c>b C.c>a>b D.c>b>a 解析:∵a=<1,b=<1,c=log π>1,∴c>a,c>b,又∵幂函数 y=x为增函数,∴b>a, 3 ∴c>b>a,故选D. 答案:D 5.已知e-e=2,则e-e的值为( ) A.2 B.8C.10 D.14 解析:∵e-e=2, ∴两边同时3次方,得(e-e)3=8, 化简得e-e-3(e-e)=8. 又∵e-e=2,∴e-e=8+6=14. 答案:D 6.(2024·河南新乡检测)已知lg a,lg b是方程6x2-4x-3=0的两根,则2=( ) A. B. C. D. 解析:由已知得lg a+lg b==,lg a·lg b=-=-,所以2=(lg b-lg a)2=(lg b+lg a)2-4lg a·lg b=2-4×=.故选D. 答案:D 7.(2024·四川成都模拟)国家速滑馆又称“冰丝带”,是北京2022年冬奥会的标志性 场馆,拥有亚洲最大的全冰面设计,但整个系统的碳排放接近于零,做到真正的智慧场馆 绿色场馆,并且为了倡导绿色可循环的理念,场馆还配备了先进的污水、雨水过滤系统. 已知过滤过程中废水的污染物数量N(mg/L)与时间t的关系为N=N e-kt(N 为最初污染物数 0 0 量).如果前4小时消除了20%的污染物,那么污染物消除至最初的64%还需要的时间为( ) A.3.6小时 B.3.8小时 C.4小时 D.4.2小时 解析:由题意可得,N e-4k=N ,可得e-4k=,设N e-kt=0.64N =2N ,可得e-kt=(e- 0 0 0 0 0 4k)2=e-8k,解得t=8.因此,污染物消除至最初的64%还需要4小时.故选C. 答案:C 8.(2024·河南新乡模拟)已知lg 3=a,lg 5=b,则log 12的值为( ) 2 A. B. C. D. 解析:log 12=log (3×4)=log 3+2=+2=+2=+2=.故选C. 2 2 2 答案:C 9. 幂函数y=xα,当α取不同的正数时,在区间[0,1]上它们的图象是一组美丽的曲线 (如图),设点A(1,0),B(0,1),连接AB,线段AB恰好被其中的两个幂函数y=xa,y=xb的 图象三等分,即有BM=MN=NA,那么a-=( ) A.0 B.1 C. D.2解析:∵BM=MN=NA,点A(1,0),B(0,1),∴M,N,将两点坐标分别代入y=xa,y =xb,得a=log ,b=log ,∴a-=log - =0. \f(1,3 \f(2,3 \f(1,3 \f(2,3 答案:A 二、多项选择题 10.下列关系中,根式与分数指数幂的互化正确的是( ) A.-=(-x)(x>0) B.=y(y>0) C.xy=(x>0,y>0) D.x=-(x>0) 解析:对于A,-=-x (x>0),故A错误;对于B,=y(y>0),故B正确;对于C,xy =(x>0,y>0),故C正确;对于D,x=(x>0),故D错误. 答案:BC 11.若10a=4,10b=25,则( ) A.a+b=2 B.b-a=1 C.ab>8(lg 2)2 D.b-a>lg 6 解析:由10a=4,10b=25,得a=lg 4,b=lg 25,则a+b=lg 4+lg 25=lg 100=2,故 A正确;b-a=lg 25-lg 4=lg >lg 6且lg <1,故B错误,D正确;ab=lg 4·lg 25=4lg 2·lg 5>4lg 2·lg 4=8(lg 2)2,故C正确.故选ACD. 答案:ACD 三、填空题与解答题 12.(2024·山西模拟)已知函数f(x)=x2-m是定义在区间[-3-m,m2-m]上的奇函数, 则f(m)=________. 解析:由题意得m2-m=3+m, 即m2-2m-3=0,∴m=3或m=-1. 当m=3时,f(x)=x-1,定义域[-3-m,m2-m]为[-6,6],f(x)在x=0处无意义,故 舍去. 当m=-1时,f(x)=x3,定义域[-3-m,m2-m]为[-2,2],满足题意, ∴f(m)=f(-1)=(-1)3=-1. 答案:-1 13.(1)设5x=4,5y=2,则52x-y=________. (2)若100a=5,10b=2,则2a+b=________. 解析:(1)∵5x=4,∴52x=16,∴52x-y=52x÷5y=16÷2=8. (2)∵100a=5,∴102a=5,又10b=2,∴102a+b=10.∴2a+b=1. 答案:(1)8 (2)1 14.计算:(1)log 35+2log -log -log 14; 5 5 5 \f(1,2 (2). 解:(1)原式=log 35-log -log 14+log ()2=log +log 2=log 125-1=log 53 5 5 5 5 5 5 \f(1,2 \f(1,2-1=3-1=2. (2)原式= = ====1. 高分推荐题 15.(1)若a4+a3+a2+a+1=0(a∈C),则a100=________. (2)(2024·湖北武汉质检)设的整数部分为x,小数部分为y,求x2+xy+的值. (1)解析:显然a≠1,且a≠0. 由题意得,=0,∴a5=1,∴a100=(a5)20=1. 答案:1 (2)解:∵===2+,且0<<1,∴x=2,y=. 原式=22+×2×+ =4+7-++1=12.
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  1. CONNECT:[ UseTime:0.000667s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000787s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000257s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000504s ]
  6. SELECT * FROM `set` [ RunTime:0.000236s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000681s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370193 LIMIT 1 [ RunTime:0.000686s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370193 [ RunTime:0.004256s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093042 WHERE `id` = 370193 [ RunTime:0.000491s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370193 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000452s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370193 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001060s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370193 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002140s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370193 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004985s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370193 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005287s ]
0.094524s