下列函数中,当x>0时,函数值y随自变量x的增大而减小的是( )
A.y=x2 | B.y=x | C.y=x+1 | D.![]() |
更新时间:2019-06-22 20:19:18
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【推荐1】已知
,点
都在函数
的图象上,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72833b0b3001b6b4a0193a860ca1073e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f19b3feaea56ed58e4919f51bb495b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a27b0f18ac86a325dc63add1fc3b8dc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,正方形四个顶点的坐标依次为(1,1),(3,1),(3,3),(1,3),若抛物线y=ax2的图象与正方形有公共点,则实数a的取值范围是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d9ddd937-4503-4987-9792-6796c3203d62.png?resizew=134)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/d9ddd937-4503-4987-9792-6796c3203d62.png?resizew=134)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】函数y=
(x>0,a为常数)的部分图像如下图所示,那么y=
(x>0)的图像中,随着x值的增大,y值的变化情况是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/4af2e813-d72f-4b92-b918-539a1825340b.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb59638769faa7d399f622c03ee3674f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d07bbc41eb5c4ce40ecfb19b00bfcc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/4af2e813-d72f-4b92-b918-539a1825340b.png?resizew=179)
A.增大 | B.减小 |
C.先增大,后减小 | D.先减小,后增大 |
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【推荐2】在反比例函数
(
为常数)的图象上有三个点
,
,
,则函数值
,
,
的大小关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2718a50b84c9705a604d726fd722002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccbc02110922dc91aab0d325b62bb57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18af5f897d73deb01b6e1b29cd39fc59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8440fdd38f0b6dc247ac16cd243e0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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