设<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/fc28764322ca44809dc72ace6a7b45a4.png?x-oss-process=image/sharpen,200"/>，那么关于<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/75ae4e5d722c4cefb88c887e76b66848.png?x-oss-process=image/sharpen,200"/>，叙述正确的有