一、以退求进策略将复杂一般的问题,退到简单特殊的问题进行分析研究,找出其规律,然后再进上去思考解答,有利于得出所求问题的解。例1.用3、4、5、6、7、8六个数字组成两个三位数,使这两个数的积最大,应×(?)怎样排列?(第七册第62页)——这道题比较复杂,若盲目拼凑,也不易得出正确答案。因而,解题时应引导学生先退回来想想与例 First, to withdraw from the strategy to the complex general problems, retreat to simple and special problems for analysis and research to find out its laws, and then go in to think about the answer, is conducive to come to the desired solution. Example 1. Use two numbers of 3, 4, 5, 6, 7, and 8 to form two 3-digit numbers so that the product of these two numbers will be the largest and should be arranged in x (?) - This question is more complicated, if blindly pieced together, it is not easy to draw the correct answer. Therefore, the problem-solving should guide students to return to think and example