99992 19999简便计算?

2025-03-28 19:07:16
推荐回答(2个)
回答1:

分别配成100000和200000减丢 一个数即可化简

回答2:

2018.5×2013.5-2014.5×2015.5
=2018.5x2013.5-2013.5x2015.5-1x2015.5
=2013.5x(2018.5-2015.5)-2015.5
=2013.5x3-2013.5-2
=2013.5x2-2
=2011.5x2
=4023