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数学
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计算2012²+2014²-2分之2013²=
人气：131 ℃ 时间：2019-10-31 00:30:20
解答
2013²/(2012²+2014²-2)=2013²/[(2013-1)²+(2013+1)²-2]=2013²/(2013²-2*2013+1+2013²+2*2013+1-2)=2013²/(2*2013²)=1/2
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