(1+1/2+ +1/2007)x(1/2+1/3+ +1/2008)-(1+1/2+ +1/2008)x(1/2+1/3+ +1_数学解答

(1+1/2+ +1/2007)x(1/2+1/3+ +1/2008)-(1+1/2+ +1/2008)x(1/2+1/3+ +1/2007)=?

人气：200 ℃　时间：2019-11-13 06:59:16

解答

=（1+1/2+ +1/2007)x1/2008-(1/2+1/3+ +1/2007)x1/2008
=(1+1/2+ +1/2007-1/2-1/3- -1/2007)x1/2008
=1x1/2008
=1/2008