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选择典型题目,有目的地引导学生进行一题多解训练,对于调动学生发散思维能力都有重要意义。同时,通过多种解法的比较,择优弃劣,将有助于提高解题的速度和质量。现就一道竞赛试题作分析: 题目:A、B两地相距30千米,甲、乙、丙三人同时从A到B。一开始甲骑自行车带乙,丙步行;甲与乙到达C后,乙继续步行,而甲折回接丙,这样三人恰好同时到达B。已知自行车的速度是步行速度的三倍,求A、C的距
Choosing a typical topic and purposefully guiding students to a multi-solution exercise is of great significance in mobilizing students’ divergent thinking skills. At the same time, through the comparison of various solutions, choosing the best and the inferior will help improve the speed and quality of problem solving. An analysis of a test question is now underway: Topic: A and B are 30 km apart. A, B, and C are three from A to B at the same time. At the beginning, A was riding a bicycle with B and C walking. After A and B arrived at C, B continued to walk, and A returned to pick up C, so that the three happened to arrive at B at the same time. Knowing that the speed of a bicycle is three times the speed of walking, find the distance between A and C