8 | 12 | 13 | 7 | 9 | 11 | |
7 | 3 | 5 | 5 | 4 | 2 | |
和 |
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差 |
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3 + = 12 + 5=14 5+ =12
7+ =11 5+ =11 6+ =13
蜗牛偷吃了几棵卷心菜?现在还剩下几棵卷心菜?
=
14-9= 16-8=
15-8= 17-9=
13-9= 17-7=
18-9= 10+8=
14-=
13-4=
17-9 | 8+2 | 15-4 | 16-9 | 7+6 |
>>>>
12-2-5= 14-4-2= 13-3-2=
12-7= 14-6= 13-5=