您可以通过发表评论的方式提问题, 我如果有时间就会思考,  并给出答案的链接.

如果您学过Latex, 发表评论的时候请直接输入Latex公式; 反之, 请直接上传图片 (扫描、拍照、mathtype编辑), 发表评论的最后一个按钮  即可实现.

另外, 如果是书上的题目, 请给出哪本书; 如果是哪个学校的考研题, 也请注明是哪个学校哪年的, 并请通过邮件 zhangzujin361@163.com 发给我试题. 其他情形就不要发表评论了.

评论1与评论2已经给出了示例.

You  may just post a question in this webpage, and I shall think about it if I have time, and I will link the answer to it.

If you know Latex, you may just type it in latex form (after doing this, just click );

otherwise, you may just upload the picture (have you seen the last icon  in posting a comment? Just click it and upload your png,jpg or gif files which are generated by mathtype software or others).

I would be very appreciated if you point out the references you are doing.

Good luck then.