下列运算中正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2017-05-29 23:09:10
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【推荐2】有下列运算:①
;②
;③
;④![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7024fc93d86edc6fefd309099e644344.png)
,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc0d45369d91b368ec5f9fe47ba40344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131e6eeee5c3f2da57a5542d16aba92b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29697613c0af0ee552a5a6c2ec300212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7024fc93d86edc6fefd309099e644344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9248b50bb616ef5e7c6fd803dbb23c.png)
A.①② | B.②③ | C.③④ | D.②④ |
您最近一年使用:0次
单选题
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较易
(0.85)
名校
【推荐1】设
,
是实数,定义关于“∗”的一种运算如下:
.则下列结论:①若
,则
或
;②
;③若
,
,则
;④不存在实数
,
,满足
.其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5299c322df4acc7bc9ff21278616ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f23d8d27bad40719a6b85f70d124131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42701869bb52f79e110197bf5f1bd68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eae9ba258299eb489b490594397e23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f5c6b732acc2140c95a49cd129b844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010912bf0463556ad295637cb4083c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd7c3e785b430aa0bd640525bd46311.png)
A.①②③ | B.①③④ | C.①②④ | D.②③④ |
您最近一年使用:0次
单选题
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【推荐1】实数
,
在数轴上的位置如图所示,则化简
的结果是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/298caa8a-4f01-4713-94ab-c2e1c45332e8.png?resizew=245)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd31036210fb9a5d0f475107aed1179.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/298caa8a-4f01-4713-94ab-c2e1c45332e8.png?resizew=245)
A.0 | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次