计算;2013²-2011²/2012²-2012*2011
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计算;2013²-2011²/2012²-2012*2011
计算;2013²-2011²/2012²-2012*2011
计算;2013²-2011²/2012²-2012*2011
=(2013+2011)(2013-2011)/2012(2012-2011)
=2×2012×2/2012
=4