摘要
数值修约是分析化学教学的重要内容。目前,主流分析化学教材均采用“四舍六入五留双”数值修约规则。详细剖析了该规则中尾数与进舍条件的关系,指出“四舍六入五留双”修约规则中应采用“尾数的首位”而不是“尾数”设置进舍条件,否则存在逻辑错误。对比分析表明,“四舍六入五留双”以数字4、5和6为比较值设置的修约规则等价于GBT8170—2008国家标准中以数字5为比较值设置的进舍规则,但GBT8170—2008国家标准的进舍规则的逻辑、表述等优于“四舍六入五留双”规则。因此,建议分析化学教材采用GBT8170—2008国家标准规定的数值修约相关内容。
Rounding off for numerical values is an important content in the analytical chemistry teaching.The mainstream analytical chemistry textbooks adopt the rules of round half to even at present.The relationship between the mantissa and rounding condition has been analyzed in detail.The results show that not the“mantissa”but“the first digit of the mantissa”would conform to the rule.Comparative analysis shows that the rounding rules with numbers 4,5,and 6 as comparison values are the same as the GBT8170—2008 national standard with 5.However the logic and presentation of the latter are better.Therefore,it is suggested that the rounding rules of the GBT8170—2008 national standard should be adopted in analytical chemistry textbooks.
作者
陈久福
刘强强
陈百利
黄生田
郑兴文
CHEN Jiu-Fu;LIU Qiang-Qiang;CHEN Bai-Li;HUANG Sheng-Tian;ZHENG Xing-Wen(School of Chemistry and Environmental Engineering,Sichuan University of Science and Engineering,Zigong 643000,China)
出处
《化学教育（中英文）》
CAS
北大核心
2022年第8期126-128,共3页
Chinese Journal of Chemical Education
基金
四川轻化工大学教学改革项目(JG-2011)。
关键词
数值修约
四舍六入五留双
国家标准
rounding off for numerical values
round half to even
national standard
