15-3=
15-5=
18-2=
28-7=
81-9=
9X3=
49-7=
65+26=
5X4=
3X6=
45+45二
9X4=
5X6=
24-8=
25+41=
5X9=
9-3=
36-9=
6X7=
14-7=
66+26=
9X7=
6X4=
35-5=
4X3=
5X5+52=
42-6X6=
54-6-3=
4X9-6=
90-65=
4X1 =
42-7=
18-2=
45-5=
6-3=
18-3=
5X2=
8X6=
39+45=
3X9=
8X9=
56-7=
4-2=
30-6=
63-9=
28-4=
3X7=
6X2=
42-7=
4X9=
9X1 =
12-2=
6-2=
10-5=
25-5X8=
8-1X8=
4X9+40=
42-6=
4X2=
6X5=
3X6=
()X4=20
结束:
结束:
1-1=
9X2=
9X5=
6X6=
24-8=
5X5=
8-4=
14-2=
40-5=
3X9=
72-8=
49-7=
4X6=
8X7=
20-5=
81-9=
45-6=
15-5=
16-8=
4X1 =
8X2=
10-2=