2013x2015-2014x2012简便计算

2025-03-01 23:06:59
推荐回答(1个)
回答1:

2013x2015-2014x2012
=(2014-1)(2014+1)-2014(2014-2)
=2014²-1-2014²+4028
=4028-1
=4027