解题方法
1 . 已知
,
,现有如下说法:①
;②
;③
.则正确的说法有______ .(横线上填写正确命题的序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb4a2d342b5210b2a7f66c87b92caee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee38aaef3d774f1f3ec9feec48719a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efa8c67c04d16b7e2d20f9fd90264ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ba5f6d6fd74616791ca9634c0ac55d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/436bd161a549d55e748a72d95f71ea8c.png)
您最近一年使用:0次
2 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d55b0ae3c23ca7643b4eec491a12409.png)
______________ .(请用数字填写)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d55b0ae3c23ca7643b4eec491a12409.png)
您最近一年使用:0次