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我们在解数学问题时常常遇到这样的两种困难:(1)条件似乎不足;(2)条件信息太多.当由条件获得的信息(简称条件信息)较多时,如何快速准确选取对问题解决最有价值的信息,关系到能否迅速快捷地解决问题,甚至关系到解题的成败.本文谈谈在面对问题时,如何准确选择最价值的条件信息.一、试题呈现(2015年南通中考题)如图1,矩形ABCD中,F是DC上一点,BF⊥AC,垂
We often encounter such two problems in solving mathematical problems: (1) the conditions seem to be insufficient; (2) there are too many conditions and how to quickly and accurately select the information that is obtained from the conditions (the conditions for short) Solving the most valuable information relates to whether we can solve the problem swiftly and quickly and even the success or failure of the problem solving.This article talks about how to accurately select the most valuable condition information in the face of the problem. Nantong exam questions) as shown in Figure 1, rectangular ABCD, F is DC on a point, BF ⊥ AC, vertical