定义:
表示
的解集中整数解的个数.若
,
,
,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad44729d373185b6e7611f924bf6a2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab42740d8f095b5f7825d14c4c312096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e064a7a3cf3ccbc52f51ed256bc7037c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf6baa793e2a32a29fcd5fb33eb1f4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114ace6f0122c97d164718e618e84d07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2020·陕西·二模 查看更多[2]
更新时间:2020-04-14 16:50:56
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【推荐1】若关于
的方程
有
个不同的根,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321d0982fc75030190ba8094e23219f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】已知定义在
上的函数
,当
时,
,且对于任意的实数
(
),都有
,若函数
有且只有三个零点,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7738e1b9268ce01d23755892b0d3e819.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16a03ea9075fe944a87cc9e66dc8be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7c3c73c9309d06a7760042dc758605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164dec129ad86248c9af272a6907cf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de50d2d38e0d25de12bb7814fe6f2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653b1fe556e6a8df86f35717d61350f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】已知集合
,
,定义集合
,则
中元素的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f408dfc87e8c58f15676b38b60ed1d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edde473bb946b45d5dab065b65531705.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f25cbdab01324dcf576ce6ab7761c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f70b226287d4a61f2a96afca02183f.png)
A.77 | B.49 | C.45 | D.30 |
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解题方法
【推荐2】设集合A的最大元素为M,最小元素为m,记A的特征值为
,若集合中只有一个元素,规定其特征值为0.已知
,
,
,…,
是集合
的元素个数均不相同的非空真子集,且
,则n的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c6ab6d0dc544cc915864198cd9affa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a227a694dc404d1184578c7d278fd8d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec2073c860f268179ab431835d7bd1f.png)
A.14 | B.15 | C.16 | D.18 |
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