我要过程挖``````````````````(*+﹏+*)~@
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我要过程挖``````````````````(*+﹏+*)~@我要过程挖``````````````````(*+﹏+*)~@我要过程挖``````````````````(*+﹏+*)~@=(1+
我要过程挖``````````````````(*+﹏+*)~@
我要过程挖``````````````````(*+﹏+*)~@
我要过程挖``````````````````(*+﹏+*)~@
=(1+2-3)+(-4+5+6-7)+(-8+9+10-11)+.(-2004+2005+2006-2007)+(-2008+2009)
=1
1+2+5+6+9+10+...+2005+2006+2009-3-4-7-8-11-12-...-2007-2008=0
=0