简便运算6.4-0.128\0.8

6.4-0.128\0.8
=2^6/10 - (2^7/1000)/(2^3/10)
=2^6/10 - (2^7/1000)×(10/2^3)
=(2^6×10)/100 - (2^4/100)
=(2^6×10-2^4)/100
=2^4(4×10-1)/100
=16×39/100
=6.24

这不用简便计算还容易些呢！