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2011年第3期《中小学数学》(小学版)刊登了黄良.春的《一道奥数题的解答及其拓展》一文,黄老师谈到了这样一道数学题的解法:两绳长度的比为5:4,分别剪去28cm后,两绳剩下的长度比为3:2。则两绳原长各是多少?黄老师本着“有助于学生对‘单位1’(或者‘1份’)更深入的理解(巩固基础)”、“进一步拓展与深化能够使学生正确的处理不同‘单位1’之间的关系(加深提高)”这两个目的,提出了他对这道题目的解法,而且又对该题进行了2次修改,同时提出了相应的解法。笔者以为,黄老师的想法是正确的,但那只是我们老师一
In 2011 No. 3 “primary and secondary mathematics” (primary school edition) published Huang Liang. Spring “an Austrian number problem solution and its expansion,” one article, Huang talked about such a math problem solution: two rope length ratio 5: 4, respectively, after cutting 28cm, the length ratio of the remaining two ropes is 3: 2. Then what is the original length of the two ropes? In accordance with the “teacher Huang help students to unit 1 ’(or’ 1 ’) a more in-depth understanding of (consolidate the foundation) ”, “to further expand and deepen Students correctly handle the relationship between different units 1 (deepen improvement), ”these two purposes, put forward his solution to this problem, but also the subject of two changes, at the same time put forward the corresponding solution. I think, Huang’s idea is correct, but it is only one of our teachers