2007-(2006-(2007-(2006-2007)))等于多少?
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2007-(2006-(2007-(2006-2007)))等于多少?
2007-(2006-(2007-(2006-2007)))等于多少?
2007-(2006-(2007-(2006-2007)))等于多少?
2007-(2006-(2007-(2006-2007)))
=2007-(2006-(2007-(-1)))
=2007-(2006-2008)
=2007-(-2)
=2009