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2013/2013²-2014×2012=【】【过程】
人气:389 ℃ 时间:2019-12-11 03:13:45
解答
2013/2013²-2014×2012
= 2013/【2013²-(2013+1)×(2013-1)】
=2013/(2013²-2013²+1)
=2013
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