(1+2/5)x(1-2/5)x(1+2/7)x(1-2/7)x...x(1-5/2005)的得数

更新时间2018-08-13 16:31:45

(1+2/5)×(1-2/5)×(1+2/7)×(1-2/7)×……×(1-2/2005)

=3/5×7/5×5/7×9/7×……×2003/2005×2007/2005

=3/5×2007/2005

=6021/10025