I1/3-1/2I+I1/4-1/3I+I1/5-1/4I+……+I1/2009-1/2008I 火速.先回答加分.先30.列式+_数学解答

I1/3-1/2I+I1/4-1/3I+I1/5-1/4I+……+I1/2009-1/2008I
火速.先回答加分.先30.列式+道理再+30
2小时内回答

人气：389 ℃　时间：2020-06-27 03:59:05

解答

1/2-1/2009
I1/3-1/2I+I1/4-1/3I+I1/5-1/4I+……+I1/2009-1/2008I
=1/2-1/3+1/3-1/4+1/4-1/5+...+1/2008-1/2009
=1/2-1/2009