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人教版义务教育课程标准实验教科书七年级数学(上册)第101页有这样一道例题:例整理一批图书,由一个人做要40小时完成.现在计划由一部分人先做4小时,
PEP (compulsory education curriculum standard experimental textbook seventh grade mathematics (the first) page 101 has such a case: the case finishing a group of books, done by a person to 40 hours now plan to do by some people first 4 hours,