(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009) (1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/26 00:48:32
(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)(1+1/2008+1/2009)*(

(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009) (1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)
(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)
(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)

(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009) (1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)
设1/2008+1/2009=t
(1+1/2008+1/2009)*(1/2008+1/2009+1/2010)-(1+1/2008+1/2009+1/2010)*(1/2008+1/2009)
=(1+t)(t+1/2010)-t(1+t+1/2010)
=t(1+t)+(1+t)/2010-t(1+t)-t/2010
=(1+t-t)/2010
=1/2010