谁能给我说说这道题怎么求:20052006×20062005-20052005×20062006=?
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/08 20:41:50
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=?
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=?
![谁能给我说说这道题怎么求:20052006×20062005-20052005×20062006=?](/uploads/image/z/20274521-41-1.jpg?t=%E8%B0%81%E8%83%BD%E7%BB%99%E6%88%91%E8%AF%B4%E8%AF%B4%E8%BF%99%E9%81%93%E9%A2%98%E6%80%8E%E4%B9%88%E6%B1%82%EF%BC%9A20052006%C3%9720062005-20052005%C3%9720062006%3D%3F)
(20052005+1)(20062006-1)-20052005*20062006
=-20052005+20062006-1
=20062005-20052005
=10000
=-20052005+20062006-1
=20062005-20052005
=10000