比多个,比少个。
3 |
5 |
6 |
4 |
8 |
9 |
7 |
10 |
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15-6=
11-6 13-7 15-8 14-8 12-9
15-7= 13-8= 12-4= 15-5=
12-8= 11-7= 18-9= 14-5=
4+6= 12-9= 11-9= 16-9=
19-9= 13-7= 14-7= 17-9=
13-4=□-□=□-□=□-□