本刊已将原“求知信箱”改为“王老师信箱”.高中学习阶段的同学,在学习过程中,遇到有关数学知识、数学方法等方面难以解决的问题,或者存在学习心理和方法方面的困惑,都可以来信或通过电子邮件向我们提出.我们将其中有意义的和带普遍性的问题刊出,并由王老师做出答复或交广大读者讨论.欢迎广大读者踊跃参与.来信请寄:430050,武汉市第23中学,王方汉老师收;电子邮箱地址:hangmegn@126.com(注:此邮箱只受理以上内容的邮件). The journal has changed the original “Knowledge Letterbox” to “Mr. Wang’s Letterbox.” During the study period, students in the high school study stage encountered problems that were difficult to solve in terms of mathematics knowledge, mathematics methods, etc., or the existence of learning psychology and methods. Confused, you can write to us or e-mail to us. We will publish its meaningful and universal issues, and by Mr. Wang to make a reply or to the general readers to discuss. Welcome readers to participate. Letters please Send: 430050, Wuhan No. 23 Middle School, Mr. Wang Fanghan received; E-mail address: hangmegn@126.com (Note: This e-mail only accepts the above content of the e-mail).