(2013 2014 2015 2016 2017 2018 2019)除以2016简便计
=(2013 2019)/2016 (2014 2018)/2016 (2015 2017)/2016 2016/2016
=2 2 2 1
=7
0
=(2013 2019)/2016 (2014 2018)/2016 (2015 2017)/2016 2016/2016
=2 2 2 1
=7