整理往期《中小学数学》杂志,偶然读到何明福老师《非常0.9》一文,文中何老师提出“0.9≠1”的观点。对此,编辑老师予以了明确纠正,并指出造成认识出误的原因在于“没有系统的学习或理解实数理论”。有鉴于此,笔者以为有必要针对数的“相等”这个话题,结合实数理论作进一步的阐释,以加深对此问题的相关认识,并唤起广大小学数学教师(特别是 Finishing the previous “primary and secondary mathematics” magazine, occasionally read Heming Fu teacher “very 0.9” a text, what the teacher proposed “0.9 ≠ 1 ” point of view. In this regard, the editorial teacher gave a clear correction, and pointed out that the cause of misunderstanding caused by “no systematic study or understanding real number theory ”. In view of this, I think it is necessary for the number of “equal ” this topic, combined with real number theory for further interpretation to deepen the understanding of this issue, and arouse the general primary school mathematics teachers (especially