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┃1/2007-1/2006┃+┃1/2006-1/2005┃+┃1/2005-1/2004┃-┃1/2004-1/2007┃
人气:455 ℃ 时间:2019-10-17 07:37:22
解答
|1/2007-1/2006|+|1/2006-1/2005|+|1/2005-1/2004|-|1/2004-1/2007|=[-(1/2007-1/2006)]+ [-(1/2006-1/2005)]+ [-(1/2005-1/2004)]-(1/2004-1/2007)=-1/200+1/2006-1/2006+1/2005-1/2005+1/2004-1/2004+1/2007=0
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