谁能给我说说这道题怎么求:20052006×20062005-20052005×20062006=?
1/2+(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+···+(1/20+2/20+··+19/20)=?
2006×19491949+20062006-2005×2007-1949×20062006=?
(1+1/2002+3/2002+··1999/2002)×(1/2002+3/2002+··+2001/2002)×(1/2002+3/2002+··+1999/2002)=?
1/2+5/6+11/12+19/20+29/30+41/42+··+9899/9900=?
人气:183 ℃ 时间:2020-05-19 00:36:53
解答
(20052005+1)(20062006-1)-20052005*20062006
=-20052005+20062006-1
=20062005-20052005
=10000
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