1.47+5.3=
0×99=
9.9÷11=
0.3×3.6=
1÷0.5=
2.8÷1.4×0.2=
-0.375=
5-=
0.32÷10%=
①8∶15=24∶x
②1.5:0.3=x∶4.2
③:=2:x
④
6.4×1.25
75×22