文档介绍：16-10=
5+6=
11-10=
7+12=
9-1 =
20-15=
20-8=
20-11 =
20-5=
14+2=
14-10=
6+11 =
12-10=
14+5=
18-4=
6+3=
163=
2+18=
14-2=
14-11 =
14+2=
5+2=
4+12=
20-7=
4+12=
9-8=
5+10=
5+9=
20-1 =
19-15=
4-1 = 10+9=
18-5=
1+6= 14+1 =
7+10= 8+11 =
19-1 = 20-13=
16-2=
6+3=
6+8=
17-13=
9-2=
5+8= 13-2=
5+3=
10-9=
15-4=
9+6=
8-2=
1+2=
1+19=
19-14= 7+1 =
4+12=
9-8=
5+10=
14-5=
6+14=
4+16=
10-2=
7-1 =
7+5=
19-18=
6-3=
7+4=
17-15=
4+15=
14-4=
14-10=
16-13=
20-11 =
1+17=
13-1 =
9-1 =
4+5=
3+15=
9-2=
10-5=
12+8=
2+1 =
1+8=
14-7=
12-7=
3+4=
19-4=
14+5=
14+6=
13+4=
14-6=
12+4=
5+9=
15+2=
20-4=
14-3=
4+6=
20-5=
12-9=
2+14=
17+3=
19-6=
4+10=
20-8=
20-14=
9-5=
5+6=
1+2=
12-5=
3+1 =
9+7=
6-3=
3+11 =
1+8=
19-11 =
17-3=
10+3=
15-11 =
19-1 =
10-7=
16-12=
10+2=
7+12=
9+7=
3+15=
11-10=
13-2=
17+1 =
14-8=
1+18=
19-14=
10-3=
5+10=
14+6=
15-2=
5+2=
16-14=
9+11 =
20-14=
9+5=
10+7=
7+9=
9+4=
6+2=
7+2=
17-3=
4+12=
9+6=
14-13=
20-4=
18-16=
8+3=
19-15= 15-11 =
5+12=
3+15=
9+2=
18-17=
14-6=
12+4=
6+12=
11-9=
9+2=
5+10=
19-8=
14-1 =
20-17=
15-9=
6-2=
2+3=
10-8=
5+1 =
17-5=
14-3=
18-6=
15-6=
16-7=
3+10=
20-7=
14+2=
11-10=
1+14=
4+12=
17-12=
12+5=
18-15=
7+12=
4+14=
14-11 =
18-8=
16+2=
7+13=
10+10=
3+14=
15-13=
16-14=
15-3=
6+13=
5+5=
19-2=
14-8=
9+7=
12+8=
10-6=
10+9=
13-2=
17-7=
2-1 =
7+1 =
20-8=
11-9=
2+6=
13-2=
3+8=
7-6=
18-11 =
19-10=
13-8=
11-2=
11-10=
2+7=
17-1 =
3+13=
14-9=
9+8=
3+11 =
15+3=
1+6=
2+14=
6+3=
15-11 = 5+9= 10-5=
9+3=
16-7=
7+1 =
14+3=
14-6=
17+2=
18-15=
19-16=
6-1 =
5+9=
3-2= 20-10=
3+11 =
15+3=
17-11 = 1+7=
18+2=
11+1 =
7+8=
11+4=
1+17=
4+11 =
20-17=7+13=19-10=6-1 =
15-6=12-7=5-1=16-13=
3+17=10+5=13+4=19-11 =
14-7=18-17=1+10=