用简便方法计算198*55

如题所述

第1个回答  2016-03-20
198*55
=(200-2)*55
=200*55-2*55
=11000-110
=10890本回答被网友采纳
第2个回答  2019-09-14
0.55x198
=0.55x(200-2)
=0.55x200-0.55x2
=110-1.1
=108.9