当前位置:首页>文档>2025届高中数学一轮复习练习:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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:第二章限时跟踪检测(五) 二次函数及其性质(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(五) 二次函数及其性质 一、单项选择题 1.若函数f(x)=x2-2x+m在[3,+∞)上的最小值为1,则实数m的值为( ) A.-3 B.-2 C.-1 D.1 2.已知m>2,点(m-1,y),(m,y),(m+1,y)都在二次函数y=x2-2x的图象上, 1 2 3 则( ) A.y<y<y B.y<y<y 1 2 3 3 2 1 C.y<y<y D.y<y<y 1 3 2 2 1 3 3.函数y=1-|x-x2|的图象大致是( ) 4.(2024·河北沧州七校联考)已知f(x)为二次函数,且f(x)=x2+f′(x)-1,则f(x)=( ) A.x2-2x+1 B.x2+2x+1 C.2x2-2x+1 D.2x2+2x-1 5.若函数f(x)=x2-3mx+18(m∈R)在(0,3)上不单调,则m的取值范围为( ) A.[0,2] B.(0,2) C.(-∞,0] D.[2,+∞) 6.(2024·湖南长沙一中模拟)已知函数f(x)=2x2-mx-3m,则“m>2”是“f(0)<0对 x∈[1,3]恒成立”的( ) A.充分不必要条件 B.充要条件 C.必要不充分条件 D.既不充分也不必要条件 7.一次函数y=ax+b(a≠0)与二次函数y=ax2+bx+c在同一平面直角坐标系中的图象 大致是( ) 8.(2024·河北保定模拟)对于任意a∈[-1,1],函数f(x)=x2+(a-4)x+4-2a的值总大 于0,则x的取值范围是( ) A.{x|13} C.{x|12} 9.已知函数f(x)=ax2+bx+c,且f(x+2)是偶函数,则下列大小关系可能正确的是() A.f(2)<f=c B.f<f(x)<c C.f(2)>f>c D.f<f(2)=c 二、多项选择题 10.由于被墨水污染,一道数学题仅能见到如下文字:“已知二次函数 y=ax2+bx+c 的图象过点(1,0),…,求证:这个二次函数的图象关于直线x=2对称.”根据现有信息, 题中的二次函数可能具有的性质是( ) A.在x轴上截得的线段的长度是2 B.与y轴交于点(0,3) C.顶点是(-2,-2) D.过点(3,0) 11.已知函数f(x)=x2-2x+a有两个零点x,x,以下结论正确的是( ) 1 2 A.a<1 B.若xx≠0,则+= 1 2 C.f(-1)=f(3) D.函数y=f(|x|)有四个零点 三、填空题与解答题 12.已知函数f(x)=x2+2ax+3,若y=f(x)在区间[-4,6]上是单调函数,则实数a的取 值范围为____________. 13.定义:如果在函数y=f(x)定义域内的给定区间[a,b]上存在x(a3} C.{x|12} 解析:由题意知,关于a的一次函数y=a(x-2)+x2-4x+4的值大于0在a∈[-1,1]上 恒成立,只需 解得 即x<1或x>3,故选B. 答案:B 9.已知函数f(x)=ax2+bx+c,且f(x+2)是偶函数,则下列大小关系可能正确的是( ) A.f(2)<f=c B.f<f(x)<cC.f(2)>f>c D.f<f(2)=c 解析:因为f(x+2)是偶函数,所以直线x=2是y=f(x)图象的对称轴.f=a·+b·+c= c,则B,C,D均不可能成立,当a>0时,f(2)是最小值,因此f(2)<f=c成立.故选A. 答案:A 二、多项选择题 10.由于被墨水污染,一道数学题仅能见到如下文字:“已知二次函数 y=ax2+bx+c 的图象过点(1,0),…,求证:这个二次函数的图象关于直线x=2对称.”根据现有信息, 题中的二次函数可能具有的性质是( ) A.在x轴上截得的线段的长度是2 B.与y轴交于点(0,3) C.顶点是(-2,-2) D.过点(3,0) 解析:由已知,得 解得 所以二次函数为y=a(x2-4x+3),其顶点的横坐标为2,所以顶点一定不是(-2,- 2),故选ABD. 答案:ABD 11.已知函数f(x)=x2-2x+a有两个零点x,x,以下结论正确的是( ) 1 2 A.a<1 B.若xx≠0,则+= 1 2 C.f(-1)=f(3) D.函数y=f(|x|)有四个零点 解析:易知二次函数对应的二次方程根的判别式Δ=(-2)2-4a=4-4a>0,解得a< 1,故A正确;由根与系数的关系,得x+x=2,xx=a,+==,故B正确;因为f(x)图 1 2 1 2 象的对称轴为x=1,点(-1,f(-1)),(3,f(3))关于对称轴对称,故C正确;当a<0时,y =f(|x|)只有两个零点,故D不正确. 答案:ABC 三、填空题与解答题 12.已知函数f(x)=x2+2ax+3,若y=f(x)在区间[-4,6]上是单调函数,则实数a的取 值范围为____________. 解析:函数f(x)=x2+2ax+3的图象的对称轴为直线x=-=-a,要使f(x)在[-4,6] 上为单调函数,只需-a≤-4或-a≥6,解得a≥4或a≤-6. 答案:(-∞,-6]∪[4,+∞) 13.定义:如果在函数y=f(x)定义域内的给定区间[a,b]上存在x(a
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  1. CONNECT:[ UseTime:0.001204s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001695s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000695s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000656s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001317s ]
  6. SELECT * FROM `set` [ RunTime:0.000645s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001413s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370238 LIMIT 1 [ RunTime:0.001063s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370238 [ RunTime:0.001836s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093236 WHERE `id` = 370238 [ RunTime:0.001095s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370238 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001291s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370238 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000959s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370238 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006205s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370238 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009696s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370238 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011881s ]
0.209223s