若
,则m+n的值为( )
![](https://img.xkw.com/dksih/QBM/2016/1/6/1573949638361088/1573949644308480/STEM/d6e07853693b4d1ea9ff3f86e893b7af.png)
A.-1 | B.3 | C.3 | D.2 |
更新时间:2016-12-06 03:51:39
|
A.-1 | B.3 | C.3 | D.2 |