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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(四) 基本不等式(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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2025届高中数学一轮复习练习:第二章限时跟踪检测(四) 基本不等式(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练习:第二章限时跟踪检测(四) 基本不等式(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练习:第二章限时跟踪检测(四) 基本不等式(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练习:第二章限时跟踪检测(四) 基本不等式(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练习:第二章限时跟踪检测(四) 基本不等式(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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限时跟踪检测(四) 基本不等式 一、单项选择题 1.若2x+2y=1,则x+y的取值范围是( ) A.[0,2] B.[-2,0] C.[-2,+∞) D.(-∞,-2] 2.已知x>0,y>0,且4xy-x-2y=4,则xy的最小值为( ) A. B.2 C. D.2 3.用一段长为L的篱笆围成一个一边靠墙的矩形菜园,则菜园的最大面积为( ) A. B. C. D.L2 4.若x<0,则函数y=x2+-x-的最小值是( ) A.- B.0 C.2 D.4 5.(-6≤a≤3)的最大值为( ) A.9 B. C.3 D. 6.已知x>0,则函数f(x)=的最小值为( ) A.-1 B.0 C.1 D.2 7.(2024·山东泰安模拟)已知x>0,y>0,且x+2y=1,若不等式+≥m2+7m恒成立, 则实数m的取值范围是( ) A.-8≤m≤1 B.m≤-8或m≥1 C.-1≤m≤8 D.m≤-1或m≥8 8.(2024·河南安阳模拟)一家商店使用一架两臂不等长的天平称黄金.一位顾客到店里 购买10 g黄金,售货员先将5 g的砝码放在天平左盘中,取出一些黄金放在天平右盘中使 天平平衡;再将5 g的砝码放在天平右盘中,再取出一些黄金放在天平左盘中使天平平衡; 最后将两次称得的黄金交给顾客.若顾客实际购得的黄金为m g,则( ) A.m>10 B.m=10 C.m<10 D.以上都有可能 二、多项选择题 9.下列不等式一定成立的有( ) A.x+≥2 B.2x(1-x)≤ C.x2+≥2-1 D.+≥2 10.(2022·新高考全国Ⅱ卷)若x,y满足x2+y2-xy=1,则( ) A.x+y≤1 B.x+y≥-2 C.x2+y2≤2 D.x2+y2≥1三、填空题与解答题 11.(1)当x>1时,x+的最小值为__________. (2)当x≥4时,x+的最小值为__________. 12.(1)(2024·江苏南京调研)设a≥0,b≥0,且2+b=1,则的最小值为________. (2)若正实数x,y满足4x2+y2+xy=1,则xy的最大值为________;2x+y的最大值为 ________. 13.(2024·安徽黄山模拟)已知函数f(x)=k-|x-4|,x∈R,且f(x+4)≥0的解集为[- 1,1]. (1)求k的值; (2)若a,b,c是正实数,且++=1,求证:a+b+c≥1. 高分推荐题 14.(2024·天津静海区模拟)已知正实数 a,b,c,a+b=3,则++的最小值为 ________. 解析版 一、单项选择题 1.若2x+2y=1,则x+y的取值范围是( ) A.[0,2] B.[-2,0] C.[-2,+∞) D.(-∞,-2] 解析:∵2x+2y≥2=2,当且仅当2x=2y时,等号成立,∴≤,∴2x+y≤,得x+y≤-2.故 选D. 答案:D 2.已知x>0,y>0,且4xy-x-2y=4,则xy的最小值为( ) A. B.2 C. D.2 解析:∵x>0,y>0,x+2y≥2,当且仅当x=2y时,等号成立,∴4=4xy-(x+ 2y)≤4xy-2, 即4≤4xy-2, 即(-2)(+1)≥0, ∴≥2,∴xy≥2.故选D. 答案:D3.用一段长为L的篱笆围成一个一边靠墙的矩形菜园,则菜园的最大面积为( ) A. B. C. D.L2 解析:设菜园平行于墙的一边长为x,其邻边长为y,则x+2y=L,面积S=xy, 因为x+2y≥2, 所以xy≤=, 当且仅当x=2y=,即x=,y=时,S =,故选A. max 答案:A 4.若x<0,则函数y=x2+-x-的最小值是( ) A.- B.0 C.2 D.4 解析:y=x2+-x-≥2+2=4,当且仅当x=-1时,等号成立. 答案:D 5.(-6≤a≤3)的最大值为( ) A.9 B. C.3 D. 解析:当a=-6或a=3时,=0;当-6<a<3时,≤=,当且仅当3-a=a+6,即 a=-时,等号成立. 答案:B 6.已知x>0,则函数f(x)=的最小值为( ) A.-1 B.0 C.1 D.2 解析:因为x>0,所以f(x)==x+-5≥2-5=-1,当且仅当x=,即x=2时,等号 成立,即当x>0时,函数f(x)的最小值为-1,故选A. 答案:A 7.(2024·山东泰安模拟)已知x>0,y>0,且x+2y=1,若不等式+≥m2+7m恒成立, 则实数m的取值范围是( ) A.-8≤m≤1 B.m≤-8或m≥1 C.-1≤m≤8 D.m≤-1或m≥8 解析:∵x>0,y>0,x+2y=1,∴+=(x+2y)·=++4≥4+2=8,当且仅当=,即x =2y=时,等号成立, ∵不等式+≥m2+7m恒成立,∴m2+7m≤8,解得-8≤m≤1.故选A. 答案:A 8.(2024·河南安阳模拟)一家商店使用一架两臂不等长的天平称黄金.一位顾客到店里 购买10 g黄金,售货员先将5 g的砝码放在天平左盘中,取出一些黄金放在天平右盘中使 天平平衡;再将5 g的砝码放在天平右盘中,再取出一些黄金放在天平左盘中使天平平衡; 最后将两次称得的黄金交给顾客.若顾客实际购得的黄金为m g,则( ) A.m>10 B.m=10 C.m<10 D.以上都有可能解析:由于天平两臂不等长,可设天平左臂长为a,右臂长为b,则a≠b,设先称得黄 金为x g,后称得黄金为y g,则bx=5a,ay=5b,∴x=,y=,∴x+y=+=5≥5×2= 10,当且仅当=,即a=b时,等号成立,但a≠b,等号不成立,即x+y>10.因此顾客实际 购得的黄金为m>10.故选A. 答案:A 二、多项选择题 9.下列不等式一定成立的有( ) A.x+≥2 B.2x(1-x)≤ C.x2+≥2-1 D.+≥2 解析:对于A,当x<0时,x+<0,故A错误;对于B,2x(1-x)=-2x2+2x=-22+ ≤,故B错误;对于C,x2+=x2+1+-1≥2-1=2-1,当且仅当x2=-1时,等号成立, 故C正确;对于D,+≥2=2,当且仅当x=1时,等号成立,故D正确.故选CD. 答案:CD 10.(2022·新高考全国Ⅱ卷)若x,y满足x2+y2-xy=1,则( ) A.x+y≤1 B.x+y≥-2 C.x2+y2≤2 D.x2+y2≥1 解析:对于A,B,由x2+y2-xy=1,得(x+y)2-3xy=1,而xy=≤2,即(x+y)2≤4,当 且仅当x=y时,等号成立,所以-2≤x+y≤2,所以A不正确,B正确;对于C,D,由x2 +y2-xy=1,得x2+y2-1=xy≤,当且仅当x=y时,等号成立,所以x2+y2≤2,所以C正 确;当x=,y=-时,x2+y2<1,所以D不正确.故选BC. 答案:BC 三、填空题与解答题 11.(1)当x>1时,x+的最小值为__________. (2)当x≥4时,x+的最小值为__________. 解析:(1)∵x>1,∴x-1>0. ∴x+=x-1++1≥2+1=5, 当且仅当x-1=,即x=3时,等号成立. ∴x+的最小值为5. (2)∵x≥4,∴x-1≥3. ∵函数y=t+在[3,+∞)上单调递增, ∴当x-1=3,即x=4时,y=(x-1)++1有最小值. 答案:(1)5 (2) 12.(1)(2024·江苏南京调研)设a≥0,b≥0,且2+b=1,则的最小值为________. (2)若正实数x,y满足4x2+y2+xy=1,则xy的最大值为________;2x+y的最大值为 ________. 解析:(1)因为2+b=1,所以a=2=,所以==+-≥2-=0,当且仅当a=0,b=1 时,等号成立.(2)∵1-xy=4x2+y2≥4xy,∴5xy≤1,∴xy≤,当且仅当y=2x,即x=,y=时,等号成 立. ∵4x2+y2+xy=1,∴(2x+y)2-3xy=1,∴(2x+y)2-1=3xy=·2x·y≤2,即(2x+y)2- 1≤(2x+y)2,∴(2x+y)2≤,∴2x+y≤,当且仅当2x=y,即x=,y=时,等号成立. 答案:(1)0 (2) 13.(2024·安徽黄山模拟)已知函数f(x)=k-|x-4|,x∈R,且f(x+4)≥0的解集为[- 1,1]. (1)求k的值; (2)若a,b,c是正实数,且++=1,求证:a+b+c≥1. (1)解:因为f(x)=k-|x-4|, 所以f(x+4)≥0等价于|x|≤k. 由|x|≤k有解得k≥0,且其解集为{x|-k≤x≤k}. 又f(x+4)≥0的解集为[-1,1],故k=1. (2)证明:由(1)知,++=1, 又a,b,c是正实数,由均值不等式,得 a+2b+3c=(a+2b+3c) =3+++≥3+2+2+2=9. 当且仅当a=2b=3c时,等号成立, 所以a+b+c≥1. 高分推荐题 14.(2024·天津静海区模拟)已知正实数 a,b,c,a+b=3,则++的最小值为 ________. 解析:由题意,++=c+=c+=c+≥c+=2c+,当且仅当=,即a=1,b=2时等 号成立.又2c+=2(c+1)+-2≥2-2=2-2,当且仅当2(c+1)=,即c=-1时等号成立, 所以++的最小值为2-2. 答案:2-2
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  1. CONNECT:[ UseTime:0.001072s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001511s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000678s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001308s ]
  6. SELECT * FROM `set` [ RunTime:0.002136s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001838s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370243 LIMIT 1 [ RunTime:0.003512s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370243 [ RunTime:0.004101s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093255 WHERE `id` = 370243 [ RunTime:0.001191s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370243 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001222s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370243 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001108s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370243 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002430s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370243 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004160s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370243 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003733s ]
0.207260s