名校
1 . 已知集合
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd83907b1f4a03ab969fbdda6cf908d3.png)
(1)当
时,求
.
(2)是否存在实数
,使得
,说明你的理由;
(3)记
若
中恰好有3个元素,求所有满足条件的实数
的值.(直接写出答案即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/857f9714cce576c2e77b925edb9c9621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd83907b1f4a03ab969fbdda6cf908d3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3744e71abf4b43e128eabea9181b712.png)
(2)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d322409dc07251b75e28050217c0561.png)
(3)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d01a8873720061d3f93cd6f1b79e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/709a1f33195ab62f2da488b27a219c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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名校
2 . 已知函数
.
(1)用函数单调性的定义证明函数
在区间
上是增函数;
(2)求函数
在区间
上的最大值和最小值;(第( 2 )小题直接写出答案即可 )
(3)若对任意
,
恒成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1510639120a1883e66f13794a9df9179.png)
(1)用函数单调性的定义证明函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e390f45a8413c7b10023ea0d6543ca0.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fab11f38ab8593932082ec4d9c8c91f.png)
(3)若对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97148e04ca6a9f9dca0aba91ce4e1d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20e9fee5cd966d902e0ae35538d24e5.png)
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2019-12-08更新
|
316次组卷
|
2卷引用:北京市第二十二中学2019-2020学年高一上学期期中数学试题
3 . 某同学探究函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
的最小值,并确定相应的x的值.先列表如下:
请观察表中y值随x值变化的特点,完成下列问题:((1)(2)问的填空只要写出结果即可)
(1)若
, 则
.(请填写“
, =,
”号);若函数
在区间 (0,2)上递减,则
在区间 上递增;
(2)当
时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
的最小值为 ;
(3)根据函数
的有关性质,你能得到函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5effb3053cf609f59178641cd48167.png)
的最大值吗?为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118c9c0597d2c72126fbc4cc3927108e.png)
x | … | ![]() | ![]() | 1 | ![]() | 2 | ![]() | 4 | 8 | 16 | … |
y | … | 16.25 | 8.5 | 5 | ![]() | 4 | ![]() | 5 | 8.5 | 16.25 | … |
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdfb7f9b4a4e8898702a030c5981dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/915b3d29d0c7dd83c188e3ce31f52fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be22faef62e7a035eb39a2e020c880e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a009fc98a713bd1f25d427a02322464d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab03556c333ab0b55fe86c937b2a5763.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4426903eb63c0cf1b8e19d97f25398f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/118c9c0597d2c72126fbc4cc3927108e.png)
(3)根据函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5effb3053cf609f59178641cd48167.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e970b5a89849b870c50b39e97ee3bdf2.png)
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名校
解题方法
4 . 已知函数
,
.
(1)若
的定义域是
,求
的值;
(2)若
,试写出
的一个单调增区间.(答案不唯一)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180befc0989c493d3f3432955256c6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dd8b3dc4c609bab82d356a5cc2208d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ba09922c7febde33e8d0d1d62441ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2a39beea5adf5d07aea0424ca7a64f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65397f11ea8af736f38debadf420c4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
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5 . 已知集合
满足条件:若
,
,则
.
(1)若
,则集合
中是否还有其它元素?若没有,说明理由;若有,求出集合
中的所有元素;
(2)集合
是否有可能是只有一个真子集的集合?如果可能,求出集合
;如果不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dbf4c218f86b57e8f9a98b5459c8e14.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed961de27af72b7d11887ccfb6f15071.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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2020高三·全国·专题练习
6 . 已知x为实数,用[x]表示不超过x的最大整数,例如[1.2]=1,[-1.2]=-2,[1]=1.对于函数f(x),若存在m∈R且m
Z,使得f(m)=f([m]),则称函数f(x)是Ω函数.
(1)判断函数f(x)=x2-
x,g(x)=sinπx是否是Ω函数(只需写出结论);
(2)已知f(x)=x+
,请写出a的一个值,使得f(x)为Ω函数,并给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e581739cffb5676d997a58ab10d58880.png)
(1)判断函数f(x)=x2-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb84f6fbac102ccf326b2223d69cb7cc.png)
(2)已知f(x)=x+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a8f0160b263ed759371bf91bae29756.png)
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7 . 某公司为了发展业务,制订了一个激励销售人员的奖励方案:①当销售利润不超过10万元时,不予奖励;②当销售利润超过10万元,但不超过20万元时,按销售利润的20%予以奖励;③当销售利润超过20万元时,其中20万元按20%予以奖励,超过20万元的部分按40%予以奖励.设销售人员的销售利润为
万元,应获奖金为
万元.
![](https://img.xkw.com/dksih/QBM/2021/1/15/2636847844376576/2640050724765696/STEM/ac2310badfd84878926b08cf9f5b7dce.png?resizew=511)
(1)求
关于
的函数解析式,并画出相应的大致图象;
(2)若某销售人员获得16万元的奖励,那么他的销售利润是多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2021/1/15/2636847844376576/2640050724765696/STEM/ac2310badfd84878926b08cf9f5b7dce.png?resizew=511)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)若某销售人员获得16万元的奖励,那么他的销售利润是多少?
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