用简便方法计算2013X2015-2012X2014

2024-11-04 13:24:11
推荐回答(1个)
回答1:

小朋友,答帆含案历轿侍是这个样子滴:
2013*2015 - 2012*2014
=(2012 + 1)肢吵*2015 - 2012 * 2014
= 2012 * 2015 + 2015 - 2012 * 2014
= 2012 * (2015 - 2014) + 2015
= 2012 + 2015
= 4027