45.2-(32.4-18.5)怎样简便计算

问题描述:

45.2-(32.4-18.5)怎样简便计算

45.2-(32.4-18.5)
=45.2+18.5-32.4
=63.7-32.4
=31.3

45.2-(32.4-18.5)=45-(32-18)+0.2-(0.4-0.5)=31+0.3=31.3

45.2-(32.4-18.5)
=45.2-32.4+18.5
=45-32+18+(0.2+0.5-0.4)
=31.3