若am=8,an=2,则am﹣2n的值等于( )
A.1 | B.2 | C.4 | D.16 |
更新时间:2019-04-13 00:12:04
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适中
(0.65)
【推荐2】下列有四个结论,其中正确的是( )
①若
,则x只能是2;
②若
的运算结果中不含
项,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
③若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ddd4c4f98bcd2c9fc5909851f07a65.png)
④若
,则
可表示为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2723d9d3030efcc03ab47b37288d93d8.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412acdbc14a6f27ed1323de6bcec6122.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f512f44a144472cdc31190c80d0729bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ddd4c4f98bcd2c9fc5909851f07a65.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8288e5e2341ecf86858f1bc6ff5b62e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56d949aeb3258db8f404f322f20774d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
A.①②③④ | B.②③④ | C.①③④ | D.②④ |
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