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配方法具体而基本,看起来很平常,但如果灵活大胆地使用,往往能出奇制胜,简捷地解决一些相当困难的问题。例1已知
The method is concrete and basic, and it seems to be normal. However, if you use it flexibly and boldly, you can often win surprises and simply solve some very difficult problems. Example 1 is known