1乘2分之2005加2乘3分之2005加3乘4分之2005……加2004乘2005分之2005等于多少

2024-12-26 19:37:56
推荐回答(4个)
回答1:

=2005×(1/1*2+1/2*3+……+1/2004*2005)
=2005×(1-1/2+1/2-1/3+……+1/2004-1/2005)
=2005×(1-1/2005)
=2005×2004/2005
=2004 对吧

回答2:

=2005×(1/1*2+1/2*3+……+1/2004*2005)
=2005×(1-1/2+1/2-1/3+……+1/2004-1/2005)
=2005×(1-1/2005)
=2005×2004/2005
=2004

回答3:

1/1乘2+1/2乘3+1/3乘4+..+1/2004乘2005
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/2004-1/2005)
=1-1/2005=2004/2005

回答4:

等于2004,,,