1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+……+100)=?.

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1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+……+100)=?.

1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+……+100)=?.
1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+……+100)=?.

1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+……+1/(1+2+3+……+100)=?.
因为1=1*2/2
1+2=2*3/2
.
1+2+3+4+.2003=2003*2004/2
所以
1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+...+1/(1+2+3+4+.2003)
=2(1/1 - 1/2)+2(1/2 -1/3) +2(1/3-1/4)+.+2(1/2003-1/2004)
=2-2/2004
=2-1/1002
=2003/1002