文档介绍：(一)
30-22=
26-12=
16-9=
12+18=
20-12=
13-6=
17-9=
30-4=
24-7=
30-6=
23-20=
27-20=
26-17=
27-22=
12-4=
27-12=
26-25=
22-15=
27-17=
15-7=
22-4=
21-17=
12-7=
29-15=
7+5=
14-6=
27-16=
12+17=
21-6=
13+16=
20-3=
15+15=
9+15=
11-3=
23-5=
20-14=
13-5=
22-18=
7+8=
13+13=
29-18=
28-25=
21-5=
26-14=
22-14=
20-2=
12+12=
20-13=
21-4=
23-12=
11-2=
30-9=
9-3=
26-18=
27-14=
29-26=
28-13=
30-19=
27-10=
22-17=
21-10=
12-8=
21-14=
7+9=
12+13=
22-8=
12+14=
29-28=
25-17=
26-13=
22-7=
20-8=
29-11=
24-10=
28-21=
8+20=
(二)
29-13=
28-20=
11+16=
29-12=
21-20=
22-3=
11+18=
8+19=
20-15=
23-8=
18-9=
24-13=
25-8=
28-12=
23-9=
22-20=
19-10=
22-11=
29-27=
24-11=
8+9=
30-18=
27-19=
22-12=
24-22=
14+14=
22-5=
14+15=
26-8=
29-22=
20-18=
29-16=
30-1=
23-19=
25-22=
30-17=
27-26=
28-9=
26-19=
30-11=
28-14=
13-7=
25-11=
21-11=
28-10=
27-11=
25-10=
22-6=
11-7=
30-23=
30-24=
13+14=
20-5=
26-20=
28-22=
13-4=
22-19=
30-28=
23-11=
24-15=
26-9=
27-13=
30-16=
27-18=
21-12=
12-3=
29-17=
25-23=
23-21=
12+15=
21-16=
28-11=
24-16=
21-7=
30-29=
26-23=
(三)
20-19=
21-3=
11-5=
23-6=
16-8=
20-17=
25-12=
24-19=
25-13=
23-15=
12-9=
30-7=
30-13=
30-14=
24-6=
14-7=
11+12=
25-15=
14-8=
29-21=
27-24=
26-15=
27-9=
23-7=
11-4=
21-8=
28-15=
23-13=
26-16=
28-24