(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 12:23:51
![(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)](/uploads/image/z/1247423-23-3.jpg?t=%282013%2F1-1%29%282012%2F1-1%29%282011%2F1-1%29.%283%2F1-1%29%282%2F1-1%29)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
(2013/1-1)(2012/1-1)(2011/1-1).(3/1-1)(2/1-1)
=(-2012/2013)(-2011/2012)(-2010/2011)……(-2/3)(-1/2)
=1/2013
一共2012个分数,所以总的符号为正号
前一个的分子可以和后一个的分母约掉.
所以,最后的答案是1/2013
(1/2013-1)(1/2012-1)(1/2011-1)......(1/3-1)(1/2-1)
=(1-1/2013)(1-1/2012)(1-1/2011)......(1-1/3)(1-1/2)
=(2012/2013)(2011/2012)(2010/2011)……(2/3)(1/2)
=1/2013