2001又110分之1+2002又132分之1+2003又156分之1+2004又182分之1=2001+1/110+2002+1/132+2003+1/156+2004+1/182=2001+2002+2003+2004+1/(10*11)+1/(11*12)+1/(12*13)+1/(13*14)=8010+1/10-1/11+1/11-1/12+1/12-1/13+1...