ruby 模块中函数参数错误

![![![图片说明](https://img-ask.csdn.net/upload/201510/18/1445134618_560989.png)图片说明](https://img-ask.csdn.net/upload/201510/18/1445134669_926112.png)图片说明](https://img-ask.csdn.net/upload/201510/18/1445134588_663292.png)图片说明
问题如题，谢谢