计算:251/2008×2009+251/2009×2010=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/29 01:14:34
计算:251/2008×2009+251/2009×2010=计算:251/2008×2009+251/2009×2010=计算:251/2008×2009+251/2009×2010=251/(20

计算:251/2008×2009+251/2009×2010=
计算:251/2008×2009+251/2009×2010=

计算:251/2008×2009+251/2009×2010=
251/(2008×2009)+251/(2009×2010)
原式=251×[1/(2008×2009)+1/(2009×2010)]
=251×[1/2008-1/2009+1/2009-1/2010]
=251×1/(1004×2010)
=1/(8040)