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在一般解题中,按照习惯,总是设而必求, 但对有些题目,可以设而不求,这样可提高同学们的解题质量和速度．例1 为了使某项工程提前20天完成任务,需将原定工作效率提高25％,则原计划完成这项工程需要_____天．分析要求计划完成这项工程所用的时间,需要知道工作总量和工作效率,但两者均未给出,故不妨分别用代数式表示它们,只要求它们的比即可．
In the general problem solving, according to the habit, always set and must be sought, but for some topics, you can set rather than demand, this can improve the quality and speed of the students’ problem solving. Example 1 In order for a project to complete its task 20 days in advance, the original work efficiency needs to be increased by 25%. The original plan to complete this project requires _____ days. The time required for the analysis to require the project to complete the project requires the knowledge of the total amount of work and the efficiency of the work, but neither of them is given, so it may be necessary to express them in algebraic form and only require their ratios.