1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 20:31:58
1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交

1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交
1/3×5+1/5×7+1/7×9.+1/2011×2013
Peasa快点,明天要交

1/3×5+1/5×7+1/7×9.+1/2011×2013Peasa快点,明天要交
1/3×5+1/5×7+1/7×9.+1/2011×2013
=1/2[(1/3-1/5)+(1/5-1/7)+(1/7-1/9)+……+(1/2011-1/2013)]
=1/2(1/3-1/2013)
=1/2*670/2013
=335/2013