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来源:学生作业帮助网 编辑:作业帮 时间:2024/08/14 12:50:20
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(1/2014-1)(1/2013-1)(1/2012-1)—(1/3-1)•(1/2-1) 告
(1/2014-1)(1/2013-1)(1/2012-1)—(1/3-1)•(1/2-1)
(1/2014-1)(1/2013-1)(1/2012-1)—(1/3-1)•(1/2-1) 告(1/2014-1)(1/2013-1)(1/2012-1)—(1/3-1)•(1/2-1)
2013/2014乘2012/2013以此类推,