(1/2015-1)(1/2014-1)(1/2013-1)……(1/3-1)(1/2-1)简便计算,麻烦给个答案

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(1/2015-1)(1/2014-1)(1/2013-1)……(1/3-1)(1/2-1)简便计算,麻烦给个答案
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(1/2015-1)(1/2014-1)(1/2013-1)……(1/3-1)(1/2-1)简便计算,麻烦给个答案
(1/2015-1)(1/2014-1)(1/2013-1)……(1/3-1)(1/2-1)简便计算,麻烦给个答案

(1/2015-1)(1/2014-1)(1/2013-1)……(1/3-1)(1/2-1)简便计算,麻烦给个答案