设函数
,已知不等式
的解集为
.
(1)解不等式
>1.
(2)当x>1时,求
的最小值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2754c1e1fb1f11f8bf6ab8cebd8325e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b666663ce3537a634a3b427b418eb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15283b27721153d40cc9a8f6b2b42608.png)
(1)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d97ba57cc518bf8bf92bfcfd5ec397.png)
(2)当x>1时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8d0a5c99ad84fd122c45d77299ae84.png)
更新时间:2020-07-04 12:29:35
|
相似题推荐
解答题-问答题
|
较易
(0.85)
解题方法
【推荐1】已知非空集合
,
.
(1)若
,求
;
(2)若
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cd310f0271106c472a4245d6184edab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91a552b7dc944255e0ed0809a38cc4f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a771ea99b604283c03ac3c8dae942e9e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6645ad088927971f8a8b60d951d93d1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐2】已知集合
,
,求:
(1)
,
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791a3842183ec2f79c34f925a76d4f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db84edd5f94f8e2cb6c2010b14e9939d.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdbfa7a63fdf5717d40c8c9a73ec160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cae7f232e879480b3808e2941e15dfc.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知函数
.
(1)若
的解集是
,求不等式
的解集;
(2)设
,
,若
是
的充分不必要条件,求实数
的取值范围;
(3)若
,
,解关于x的不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdad1e5b53f816db7b5f092357e040a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a71baf6217604517fd98fa97d0f55b43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e12a49601927242c500e1e3b331112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/259fc8df4d5abe96e0e2af06e5df0010.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/044070dfca41990c0f3b5025a7c88182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67a13e843c5aae0d97f71774967e32e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4638bb5fb3deacdcf65da8c8ac4aacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b599a5cbbca3c20638a1a14ff37d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】已知关于x的不等式-x2+ax+b>0.
(1)若该不等式的解集为(-4,2),求a,b的值;
(2)若b=a+1,求此不等式的解集.
(1)若该不等式的解集为(-4,2),求a,b的值;
(2)若b=a+1,求此不等式的解集.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】已知p:
,q:x>a2-2a-1
(1)若
为真,求
的取值范围;
(2)若
是
的充分不必要条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a2c324084796960af8d78f82a8a930.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc1bb9d53a27d484396ad74d6a26e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】已知全集
,集合
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a64dc61989ca50b9ee19d835c4ed268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de490686466148b49216f8bc4e2346a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/470695a6aef744da44d3b903b11dafeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322861985b5b7271b134b47f649e5a99.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐3】几年国家出台的惠民政策越来越多,政府出资的“旧房改造”工程使得许多老旧校区旧貌换新颜,从根本上提高了百姓的生活质量.如图,在改造某小区时,要在一处公共区域搭建一间背面靠墙(墙长7米)的房屋,图形所示为房屋俯视图,房屋地面面积为
房屋正面的造价为600元
,侧面的造价为200元
,顶部总造价为4800元,如果墙面高为3m,不计房屋背面和地面的费用,设总造价为
元.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/23b944d4-c4e3-455e-9628-cbf94bc68775.png?resizew=163)
(1)请将总造价
表示为正面边长
的函数,怎样设计房屋边长能使总造价最低?最低总造价是多少?
(2)如果所需总费用不超过22800元,求房屋正面边长
的取值范围是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1c4402970edc16bbf33e726b41409c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4199642ca2ebc46683fb136c1ec5a97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4199642ca2ebc46683fb136c1ec5a97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/23b944d4-c4e3-455e-9628-cbf94bc68775.png?resizew=163)
(1)请将总造价
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)如果所需总费用不超过22800元,求房屋正面边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
【推荐1】某植物园中有一块等腰三角形
的花圃,腰长为20米,顶角为30°,现在花圃内修一条步行道(步行道的宽度忽略不计),将其分成面积相等的两部分,分别种植玫瑰和百合.步行道用曲线
表示(D、E两点分别在腰
、
上,以下结果精确到0.01).
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712323799859200/2715189758091264/STEM/f9c447e236bf4fae9e4852822daedf6f.png?resizew=208)
(1)如果曲线
是以A为圆心的一段圆弧(如图1),求
的长;
(2)如果曲线
是直道(如图2),求
的最小值,并求此时直道
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712323799859200/2715189758091264/STEM/f9c447e236bf4fae9e4852822daedf6f.png?resizew=208)
(1)如果曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如果曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21d14b632a1aaa29ac232715a3d28e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
名校
【推荐2】汽车智能辅助驾驶已开始得到应用,其自动刹车的工作原理是用雷达测出车辆与前方障碍物之间的距离(并集合车速转化为所需时间),当此距离等于报警距离时就开始报警提醒,等于危险距离时就自动刹车.若将报警时间划分为4段,分别为准备时间
、人的反应时间
、系统反应时间
、制动时间
,相应的距离分别为
,
,
,
,如下图所示.当车速为
(米/秒),且
时,通过大数据统计分析得到下表给出的数据(其中系数
随地面湿滑程度等路面情况而变化,
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/6f0f9961-2cf2-4133-a21d-4afb0efc9757.png?resizew=626)
(1)请写出报警距离
(米)与车速
(米/秒)之间的函数关系式
;并求当
,在汽车达到报警距离时,若人和系统均未采取任何制动措施,仍以此速度行驶的情况下,汽车撞上固定障碍物的最短时间;
(2)若要求汽车不论在何种路面情况下行驶,报警距离均小于50米,则汽车的行驶速度应限制在多少千米/小时?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9fd58e71dcae6cafaf9037d20ebd76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c7eb49a823f757461cd5260757b088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd84a8f95166367063218ee03ffd5a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db31d2bbc9b044646fd026f239e7b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f44f67ab69be2217f7884536cfa53aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d0252c1b2f7d2a84b5c985d19d547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b4a3fcb35f808ee8d74cb65ceddfe4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4b5ca43d98abcb743ee9d39c842aa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/18/6f0f9961-2cf2-4133-a21d-4afb0efc9757.png?resizew=626)
阶段 | 0.准备 | 1.人的反应 | 2.系统反应 | 3.制动 |
时间 | ![]() | ![]() | ![]() | |
距离 | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc13a607ac0c7f76d252d7cb1bb040fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1b8d1a0685c8dd310d291612035477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
(2)若要求汽车不论在何种路面情况下行驶,报警距离均小于50米,则汽车的行驶速度应限制在多少千米/小时?
您最近一年使用:0次