0.23=
2.4-=
0.8++-0.8=
2.1÷0.3=
11.6y-9y=
1-=
12.4+8.6=
3.6÷0.9=
4a+1.2a=
4×0.25÷0.25×4=
+=
-=
2-=
0.5+=
12÷18=
1.45+6.7=
8×0.125=
23=
-=
+=
1-=
+=
+2=