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计算:|1/2009-1/2008|-|1/2010-1/2008|+|1/2010-1/2009|
人气:457 ℃ 时间:2020-03-28 13:07:01
解答
=(1/2008-1/2009)-(1/2008-1/2010)+(1/2009-1/2010)
=1/2008-1/2009-1/2008+1/2010+1/2009-1/2010
=0
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