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The workshop proceeding DASFAA 2020 presents a wide range of the following topics such as Big Data Management and Service, Semantic Computing and Personalization, Big Data Quality Management, Graph Data Management and Analysis, and Artificial Intelligenc
A. 每月付月租费22元,然后按0.2元/分钟计费; B. 无月租,按0.4元/分钟计费。请问每月通话在多少分钟时,两种计费方式话费相同?每月通话时间在什么X围A套餐较省钱?〔5分〕答案〔本题5分〕解:设每月通话在x分钟时,两种计费方式话费相同。 ……〔1分〕22+0.2x = 0.4x ……〔3分〕0.2x = ...
题目阅读下面的文言语段,完成问题。 李尚书景让少孤,母夫人孀居,犹才未中年。夫人性严明,训励诸子,言动以礼,姻族敬惮。居东都,诸子尚幼,家贫无资。时霖雨久,宅墙夜隤,僮仆修筑,忽见一船槽,实之以钱。婢仆等来告,夫人戒之曰:“吾闻不勤而获犹谓之灾,士君子所慎者,非常之得也。若...