在横线上里填上合适的数:(1)0.84×6.4=6.4× (2)1.25×9.3×0.8=9.3×( ×0.8)(3)2.17×0.54+0.46×2.17=2.17×( + )(4)3.4×101=3.4× +3.4× .
3÷ == :12=七成五= %
÷10==9: == :40.
18: = :20== ÷40=1.2.
1÷4= ÷12==6: = (小数)
4÷5==== [小数].