《中小学数学》小学版2007第7、8期刊载了薛雪原老师的文章——《比例改变了吗?》(以下称《比例》)。在《比例》中,薛老师针对根据等式3×40=8×15可以写出几个不同比例的问题,提出了“相同比例”和“不同比例”的问题,认为根据等式3×40=8×15只可以写出4个不同的比例,并且为自己的观点阐述了三个理 “Primary and secondary mathematics” primary school 2007 issue 7, 8, published Xue Xueyuan teacher’s article - “the proportion has changed?” (Hereinafter referred to as “ratio”). In “Proportions,” Mr. Xue raised the questions of “same proportions” and “different proportions” for the problem that several different scales can be written according to the equation 3 × 40 = 8 × 15. According to Equation 3 × 40 = 8 × 15 can write only four different proportions, and for their own point of view the three rationale