|1/2007-1/2006|+|1/2008+1/2006|+|1/2008-1/2007|
=1/2006-1/2007+1/2008+1/2006+1/2007-1/2008
=1/2006+1/2006
=1/1003
如果不懂,祝学习愉快!
|1/2007-1/2006|+|1/2008+1/2006|+|1/2008-1/2007|
=1/2006-1/2007+1/2008+1/2006+1/2007-1/2008
=1/2006+1/2006
=1/1003
如果不懂,祝学习愉快!