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解答工程应用题时,除了一般解法,还有较为简单的解法.例1整理一批图书,由一个人做要40h完成.现计划由一部分人先做4h,然后增加人与他们一起再做,完成这项工作.假设这些人的工作效率相同,具体应先安排多少人工作?摘自课本例题:人教版七上数学3.4《实际问题与一元一次方程》.一般解法:分析:本题工作总量可看作1,则人均效率(一个人做1h
Answer engineering application questions, in addition to the general solution, there is a simple solution.Example 1 finishing a group of books, done by a person to 40h.It is planned to do by some people first 4h, and then add people to do with them, Completion of this work. Assuming that these people work the same efficiency, the specific number of people should be arranged first work Excerpts from the textbook example: PEP 7 Mathematics 3.4 “practical problems and a one-time equation.” General solution: Analysis: The total amount of this title Can be regarded as 1, the per capita efficiency (one person to do 1h