已知方程
有4个不同的根,则实数
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b63e040650440486916db23780e2679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2019-11-07 00:05:40
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单选题
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较难
(0.4)
【推荐1】若方程 log2x+2x-a=0 在区间[1,2]内有解,则实数 a 的取值范围是( )
A.[2,3] | B.[2,4] |
C.[2,5] | D.[2,6] |
您最近一年使用:0次
单选题
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较难
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【推荐2】已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac295452628eed50342766c57911c5e.png)
,
,有下述4个结论:
①
;②
;③
;④
.
其中正确结论的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac295452628eed50342766c57911c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2714f1eb0e74a1a31fa2c35275d368e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3604274ad6707a906eba371a9e884144.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b70fc850e0eec4580731c4d8c74849a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a788b81405c3642b243211c75be57aac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54053d4791aec2f60f23499090a0547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181f72cb378bcc21f683e3865c0441bf.png)
其中正确结论的个数是( )
A.1 | B.2 | C.3 | D.4 |
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【推荐3】已知函数
若方程
恰有四个不相等的实数根,则实数
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77586145050397e97f381b510a448e61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be7779b07a1de1181e7e29beb7f0b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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名校
【推荐1】已知函数
,函数
有四个不同的零点
、
、
、
,且满足:
,则
的取值范围是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a64581f9a48811089063d9602eaf15b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c92128913cda255fa47cbb808809a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3604274ad6707a906eba371a9e884144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52c147cc77232fc38526d670ce28dae.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐2】已知
,互不相同的正数
满足
,则
的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0798f7519feb24c7f051874dff73eaf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d10449bc77d692a7270e0f20a68cdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a77c42634098327dd27ba3903c2bbcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6bb99e2251df1777c5288d603170bd2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次