中国有句古话叫作:“磨刀不误砍柴功”·意思是说砍柴之前的准备工作绝不会延误砍柴的时间,反而使砍柴时更加顺利·数学解题尤如砍柴一样·解题前的仔细阅读、细心观察和认真分析,从表面上看似乎耽搁了一些时间,一旦在前面的“磨砺”中使“刀锋”变犀利了,则“砍柴”的时间会大 There is an old saying in China: “A sharp knife does not miscut the firewood.” This means that the preparatory work before cutting wood will not delay the time for cutting firewood, but it will make the firewood more smooth. The mathematical problem solving is like cutting firewood. The same careful reading, careful observation, and careful analysis before the problem-solving seem to delay some time on the surface. Once the “blade front” is sharpened in the previous “sharpening”, the time for “cutting wood” will be large.