3×=
3.14×20=
3.6÷0.9=
125%×80=
81÷=
16:8=
99×0.8+0.8=
24×=
2.28-0.18=
1÷0.25=
3.75+=
4.8÷3=
-=
×6.9=
0.1÷0.1%×0.8=