9+7=
8+6=
6+8=
10-1=
3+4+2=
7+5=
16-4=
6+5=
4+9=
6+4-7=
11+0=
18-7=
15-10=
2+8=
9-7-2=
□-□=□
3+14 2+23 4-12
55-2 5-12 34-1
2.1÷ = × = 52×79≈ 2.5×7.8×0.4=