30×7= 27×0= 39÷3= 54÷6=32÷4= 0+32= 12×0+25= 21÷7+10=
÷4==0.75= %= : .
3:4== :16= :40= (小数)
:15=9: =10÷ ==0.5.
6:5== %= ÷20= (小数).
= : == ÷10= (填小数).