从本期起,我们增设“小学数学业务讲座”栏,联系小学数学教材,系统地讲解有关的数学知识,以帮助教师钻研教材,提商教学质量。请读者阅后提出意见或建议。 Starting from this issue, we have added a column entitled “Mathematics for Primary Schools” to contact elementary school mathematics teaching materials to systematically explain relevant mathematical knowledge so as to help teachers study textbooks and improve the quality of teaching. Please read the reader comments or suggestions.