(1-1/2)×(1-3/1)×.×(1-1/2008)×(1-1/2009)=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 01:29:17
![(1-1/2)×(1-3/1)×.×(1-1/2008)×(1-1/2009)=?](/uploads/image/z/343543-31-3.jpg?t=%281-1%2F2%29%C3%97%281-3%2F1%29%C3%97.%C3%97%281-1%2F2008%29%C3%97%281-1%2F2009%29%3D%3F)
x)057<<072l&mikoTO;rlՀj07Q&@Q2 AԃU?}ɎUO;ڞ}:>ӵZd@LXd_\gu
ڧLKOOOjԂۉ Dl
(1-1/2)×(1-3/1)×.×(1-1/2008)×(1-1/2009)=?
(1-1/2)×(1-3/1)×.×(1-1/2008)×(1-1/2009)=?
(1-1/2)×(1-3/1)×.×(1-1/2008)×(1-1/2009)=?
=(1/2)×(2/3)×(3/4)×……×(2008/2009)
前一个分母和后一个分子约分
=1/2009
1/2*2/3*3/4*... ...*2007/2008*2008/2009
=1/2009