2010⊕2009=( -2005 )1⊕1=22⊕1 = 2+1 = 32⊕2 = 3 - 2 = 1也就是⊕前后各增加1时,值减少1。因此2009⊕2009 = 2 - (2009-1)*1 = 2 - 2008 = -20062010⊕2009 = -2006 + 1 = -2005