×= ×= ×18= ÷= ÷=
21÷= ÷= ÷= ×= ÷=
3.6×25%=
0.23=
14-4÷5=
500÷25×4=
=
10001-999≈
20.97÷3.01≈
3成=
75%=( )折
六成五=( )%
80%=( )成
3%×5=
2.11×0.1=
2019-998= = = =
= = = =
+= -= ÷= 6-=
= 0.3÷0.4= 25×4%= +75%= ()×6=
6×÷2= ÷2÷= 11×-=
1+15%= 1÷50%= 37.5%+= 6-=
+= 9π= 1.25×0.8= :5=