I1/2009-1/2008I+I1/20l0-1/2009I+I1/2011-1/2010I-I1/2011-1/2008I
=1/2008-1/2009+1/2009-1/2010+1/2010-1/2011-1/2008+1/2001
=0
I1/2009-1/2008I+I1/20l0-1/2009I+I1/2011-1/2010I-I1/2011-1/2008I
I1/2009-1/2008I+I1/20l0-1/2009I+I1/2011-1/2010I-I1/2011-1/2008I
数学人气:847 ℃时间:2020-06-29 19:28:25
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