对问题1627的质疑

1.对于问题1626的繁琐解答,我们陆续收到了很多读者的来信,对其予以改进.由于来函较多,而此问题的改进解法确又非常简单(通过连线,利用勾股定理或余弦定理即可解出.当然还有其它简单解法),在此我们就不再选用新的解法刊出了.另外,北京的贺信淳老师对我们所选题目也进行了批评,我们诚恳地表示接受并对贺老师及所有给我们来信的老师表示衷心的感谢.今后,我们会继续努力,加强自身建设,争取和作者们一道把问题栏越办越好.真诚地欢迎关心爱护我们的读、作者随时给我们提出宝贵的意见及建议.感谢大家对问题栏的支持.2.对于问题1627解答的错误,读者们给出了很多不同的正确解答.根据来稿时间及解答方法,我们选用了湖南师大梁红梅等三位老师合写的文章,对原解答予以纠正.对其它提供正确解答的老师,我们在此一并表示感谢.     

ACTA MATHEMATICA SCIENTIA

Information for Authors Scope The aim of ACTA MATHEMATICA SCIENTIA is to present to the specialized readers （from the level of graduate students upwards） important new achievements in the areas of mathematical sciences. The journal considers for publication of original research （expository） papers in all areas related to the frontier branches of mathematics with other science and technology.     

Instructions to Authors

General COMMUNICATIONS IN THEORETICAL PHYSICS is published monthly by the Chinese Physical Society through the Institute of Theoretical Physics, the Chinese Academy of Sciences. Articles in this journal are abstracted/indexed in Science Citation Index （SCI）, Science Citation Index Expanded （also known as SciSearch）, ISI Alerting Services, and Current Contents/Physical, Chemical and Earth Sciences;     

JOURNAL OF COMPUTATIONAL MATHEMATICS

The Journal of Computational Mathematics is an international journal on numerical methods, analysis and applications. It publishs original research papers in English, French or German, but preferably in English. Prom 1998, it has appeared bimonthly（instead of quarterly）.     

Instructions for Authors

Submission Please type your paper in LaTeX, and e-mail the pdffile. The editorial office will confirm receipt within 3 days. If you do not receive the receipt letter, please send an e-mail to ask. The address is Editorial Board, Acta Mathematica Sinica （English Series）, Institute of Mathematics, Academia Sinica, Zhongguancun, Beijing 100080, China, email： syc@amss.ac.cn.     

Instructions to Authors

General COMMUNICATIONS THEORETICAL PHYSICS is published monthly by the Chinese Physical Society through the Institute of Theoretical Physics, the Chinese Academy of Sciences. Articles in this journal are abstracted/indexed in Science Citation Index (SCI), Science Citation Index Expanded(also known as SciSearch), ISI Alerting Services, and CurrentContents/Physical, Chemical and Earth Sciences; Science Abstracts (SA), Chemical Abstracts (CA), Mathematical Review(MR), and PЖ, etc. Contributions all over the world are most welcome.