2.8÷0.2=
4.05-4=
3.6÷0.01=
1.25×8=
0.4÷8=
0÷3.9=
0.54÷6=
7.2÷0.6=
﹣0.5= +3= ×= 0.8×=
0.23+177%= 2.5×40= 1÷= ×÷×=