6.8-3.4+3.2脱式计算 ，怎样简便运算？6.8-3.4+3.2=6.8+3.2-3.4=10-3.4=6.6
简便计算过程方法如下解:6.8-3.4+3.2=6.8+3.2-3.4=10-3.4=6.6
6.8-3.4+3.2=6.8-3.2-0.2+3.2=6.8-0.2=6.6
6.8-3.4+3.2=6.8+3.2-3.4=10-3.4=6.6
