-2a与-5a的大小关系( )
A.-2a<-5a | B.2a>5a | C.-2a=-5b | D.不能确定 |
更新时间:2018-02-23 10:03:29
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单选题
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适中
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名校
【推荐1】已知函数
,则下列说法正确的个数是( )
①若该函数图像与x轴只有一个交点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
②方程
有一个整数根是1
③存在实数a,使得
对任意实数x都成立
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d590b7296d3ccdd81d0df386a0f2c624.png)
①若该函数图像与x轴只有一个交点,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
②方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e1cc1917662886d3188086d61b58413.png)
③存在实数a,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ec4035bb91fd421b48d54037793fbe.png)
A.0 | B.1 | C.2 | D.3 |
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适中
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【推荐2】下列说法中,错误的个数为
若
,则
;
若
,则
;
若
,则
;
若
,
,则
;
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa034a35118aa937624d5d517124f0d.png)
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A.2个 | B.3个 | C.4个 | D.5个 |
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