记得十几年前的一次期末统考的评卷过程中,针对一元一次不等式组用数轴来表示其各不等式解集的公共部分时,对学生答案中究竟是否应该标上原点的问题发生了激烈的争论,场上除了笔者这个评卷新手始终坚持认为可以不用标上原点以外,其余评卷老师都认为应该标上原点,他们的理由是原点作为数轴的三要素之一,任何时候都缺一不可.在此争论不休 I remember a dozen years ago in a final examination of the marking process, for a group of inequalities with the number of axes to represent the public part of their inequality set of public part of the answer to the question whether or not should be marked on the issue of whether there is a fierce point Controversy, the field in addition to the author of this evaluation novice always insisted that you can not marked on the origin, the other marking teachers think that should be marked on the origin, their reason is that the origin as one of the three elements of the number of axes, at any time both indispensable There is endless debate here