计算:0.125×0.25×0.5×0.64 172.4×6.2+272.4×3.8.
1个8=( )个4=( )个2
( )×2=80( )×4=80( )×8=80
( )×2=72( )×4=72( )×8=72
( )×2=64( )×4=64( )×8=64
( )×2=56( )×4=56( )×8=56