(1-2/1)(3/1-1)(1-4/1)(5/1-1)(1-6/1)……(1-2010/1)(2011/1-1)

问题描述:

(1-2/1)(3/1-1)(1-4/1)(5/1-1)(1-6/1)……(1-2010/1)(2011/1-1)