9.9*212 怎样算

问题描述:

9.9*212 怎样算

9.9*212
=(10-0.1)*212
=10*212-0.1*212
=2120-21.2
=2098.8

212*10-212*0.1=2120-21.2=2098.8

=(10-0.1)*212
=10*212+0.1*212
=2120-21.2
=2098.8