|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法
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|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|
=1/20-1/21+1/21-1/22+1/22-1/23+……1/29-1/30
=1/20-1/30
=1/60
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题过程
|1/21-1/20|﹢|1/21-1/22|+|1/23-1/22|+……+|1/30-1/29|解题方法
(1-1/19)(1-1/20)(1-1/21)(1-1/22)...(1-1/99)=
(19/1-1)(20/1-1)(21/1-1)(22/1)...(99/1-1)
(19/1-1)(20/1-1)(21/1-1)(22/1)...(99/1-1)
计算:|1/21-1/20|+|1/22-1/21|+|1/23-1/22|...|1/30-1/29|
关于绝对值｜1/21-1/20｜+｜1/22-1/21｜+｜1/23-1/22｜+...｜1/30-1/29｜
|1/21-1/20|+|1/22-1/21|+|1/23-1/22|+...+|1/2004-1/2003|| |是绝对值
（1/21-1/20)+(1/22-1/21)+(1/23-1/22)+…+（1/2004-1/2003)=
（1/21-1/20)+(1/22-1/21)+(1/23-1/22)+…+（1/2004-1/2003)=
（21╱25+14╱15）×5╱7﹢1╱3
22又20分之1*21分之122 20/1*21/1
20 1/2除以21等于多少?
1/3+( )+2/7=20/21
22又20/1乘21/2
1/20加21/25等于多少?
(1/19-1)(1/20-1)(1/21-1)...(1/99-1)=?
求(1/19-1)(1/20-1)(1/21-1)...(1/97-1)=?