99.9乘11.2加15.6乘33.3加66.6乘25.4怎样巧算?急—————————

问题描述:

99.9乘11.2加15.6乘33.3加66.6乘25.4怎样巧算?急—————————

=33.3X(33.6+15.6+50.8)=33.3X100=3330