原式 = 1 ( 1/2 - 1/2 ) ( 1/3 - 1/3 ) ..... ( 1/2014 - 1/2014 ) - 1/2015
= 1 - 1/2015
= 2014/2015
0
原式 = 1 ( 1/2 - 1/2 ) ( 1/3 - 1/3 ) ..... ( 1/2014 - 1/2014 ) - 1/2015
= 1 - 1/2015
= 2014/2015