1又1/2001+2又2/2001+3又3/2001+4又4/2001+.+2000又2000/2001

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1又1/2001+2又2/2001+3又3/2001+4又4/2001+.+2000又2000/2001

1又1/2001+2又2/2001+3又3/2001+4又4/2001+.+2000又2000/2001
1又1/2001+2又2/2001+3又3/2001+4又4/2001+.+2000又2000/2001

1又1/2001+2又2/2001+3又3/2001+4又4/2001+.+2000又2000/2001
1+2000=2+1999=3+1998=.,1+2+3+4+...+1998+1999+2000=2001*1000 此题结果是2002000