20以内减法口诀
11-2= 9
12-3= 9
11-3= 8
13-4= 9
12-4= 8
11-4= 7
14-5= 9
13-5= 8
12-5= 7
11-5= 6
15-6= 9
14-6= 8
13-6= 7
12-6= 6
11-6= 5
16-7= 9
15-7= 8
14-7= 7
13-7= 6
12-7= 5
11-7= 4
17-8= 9
16-8= 8
15-8= 7
14-8=6
13-8= 5
12-8= 4
11-8= 3
18-9= 9
17-9= 8
16-9= 7
15-9=6
14-9= 5
13-9= 4
12-9=3
11-9= 2
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