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+302小时内回答

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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+302小时内回答

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+302小时内回答
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

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+302小时内回答
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

I1/3-1/2I+I1/4-1/3I+I1/5-1/4I+……+I1/2009-1/2008
=[(1/2)-(1/3)]+[(1/3)-(1/4)]+…+[(1/2008)-(1/2009)]
=(1/2)-(1/2009)
=2007/4018