+=
7.2÷0.8=
4.9×=
0.52=
40÷=
×4÷×4=
3.6÷=
4÷16=
43×101=
-=
××=
÷=
8×1.25=
4-=
1.01﹣0.99=
1.6×8+1.6+1.6=
3.14×3×0=
28.4+6=
×=
1÷=
2-=
a× a+ (a>0) 4.32÷ 4.32×0.25