简便计算过程方法如下解:6.4÷0.25-5.4×4=6.4x-5.4×4=(6.4-5.4)x4=1x4=4
6.4÷0.25-5.4×4=6.4÷(1/4)-5.4×4=6.4×4-5.4×4=(6.4-5.4)×4=1×4=4
6.4÷0.25-5.4×4=6.4x-5.4×4=(6.4-5.4)x4=1x4=4
原式=6.4×4-5.4×4=4×(6.4-5.4)=4×1=4