第1个回答 2009-09-29
|1\2001-1\2000|-|1\2002-1\2000|+|1\2002-1\2001|
=1/2000-1/2001-(1/2000-1/2002)+1/2001-1/2002
=1/2000-1/2001-1/2000+1/20002+1/2001-1/2002
=0
第2个回答 2009-09-29
|1\2001-1\2000|-|1\2002-1\2000|+|1\2002-1\2001|
=1/2000-1/2001-(1/2000-1/2002)+1/2001-1/2002
=1/2000-1/2001-1/2000+1/20002+1/2001-1/2002
=0
看后自己在琢磨琢磨
第3个回答 2009-09-29
答案是0
理由:|1\2001-1\2000|-|1\2002-1\2000|+|1\2002-1\2001|
=(1\2000-1\2001)-(1\2000-1\2002)+(1\2001-1\2002)
=0