12-7=
53-27=
2×2=
2×3=
2×3+5=
3×3=
4×2=
4×4=
1×5=
4×1+7=
80-8=
72-50=
9+48=
38-3=
2×4-8=
20+39=
4×1=
1×3=
25+17-25=
61-6=
56-8=
4×4=
5×2=
5+37=
60+20=
58-40=
7+13=
3×4=
31+27=
86-30=
4×5=
36+23=
40+48=
3×5=
8×4=
6×3=
4×9=
8×2=
3×7=
7+2=
2×6=
5×9=
36-19=
15+42=
4+4=
3×9=
( )
1÷0.05= 9.7+0.03= 2.5×4=
125%×8= 180÷6= ﹣0.5=
202= 0.6÷= 1﹣1÷9=
:= 0.53= ﹣×0=