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(-2)^2007-(-2)^2008 =-2^2007-2^2008 =-2^2007-2*2^2007 =-3*2^2007
[-2]的2006次方+【-2】的2007 =2^2006-2^2007 =2^2006-2*2^2006 =-2^2006
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