=
(1990+2008)*10+1999
____
(1991+2009)*10+2000
=
41979
____
41998
1991+1992+.+2009分之1990+1991+.+2008等于几分之几
1991+1992+.+2009分之1990+1991+.+2008等于几分之几
1990+1991+1992…..+2007+2008
1991+1992+1993+….+2002+2009
____
1990+1991+1992…..+2007+2008
1991+1992+1993+….+2002+2009
____
数学人气:569 ℃时间:2020-03-29 03:15:24
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