︱-3︱=___________ .
更新时间:2017-07-24 20:16:38
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【推荐2】下列说法:①若
,则x为负数;②若
不是负数,则a为非正数;③
;④若
,
,则
.其中正确的结论有________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd69b2900e262ae2ce32b9380c30ff95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5060ad37c403f248c937c1d59af5c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa7a2b0500d5bbdb294c9fda1a840d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fce4dc67021dbe3bbc98db08b0dd332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ccc43f4ca64fd5a69b0d30183fa887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f22fec5a381ae8aca93d876e54c79de.png)
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