已知x+
=3,则x2+
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf35027e76f8ea593f82023973d4aba3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b2ba7e9901807ef99beafa64ff956.png)
A.7 | B.9 | C.11 | D.8 |
更新时间:2018-11-21 22:12:53
|
【知识点】 运用完全平方公式进行运算解读