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原题:两绳长度比为5:4,分别剪去28cm后,两绳剩下的长度比为3:2。则两绳原长各多少?尽管这是一道奥数题,解答有一定的难度,但对解题关键点的把握有助于学生对“单位1”(或“1份”)更深入的理解(巩固基础);本题的进一步拓展与深化能够使学生正确地处理不同“单位1”之间的关系(加深提高)。本题解答的最终落脚点为确定剪去的28cm在比5:4中所占的份数,而这剪去的28cm决定了剩下的长度比(3:2)。因此,找出两个比之间的关系是能不能解
Original title: two rope length ratio of 5: 4, respectively, cut 28cm, the length ratio of the remaining two ropes 3: 2. What is the original length of the two ropes? Although this is an Austrian number, there are some difficulties in answering the question. However, grasping the key points of the question helps students to learn more about “1” or “1” In-depth understanding (consolidating the foundation); The further development and deepening of this question enables students to correctly handle the relationship between different “units 1” (deepen improvement). The final answer to this question is to determine how much of the cut 28cm is in the ratio 5: 4, and this cut 28cm determines the remaining length ratio (3: 2). Therefore, to find out the relationship between the two can not understand