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若四次测量一本书的宽度记录为:12.38cm,12.36cm,12.38cm,12.34cm,则书宽度平均值是...
问题详情:若四次测量一本书的宽度记录为:12.38cm,12.36cm,12.38cm,12.34cm,则书宽度平均值是(     )                                                     ...
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