10-9 10-8 10-7 10-6
10-5 10-4 10-3 10-2
10-1 9-8 9-7 9-6
9-5 9-4 9-3 9-2
9-1 8-7 8-6 8-4
8-3 8-2 8-1 7-6
7-5 7-4 7-3 7-2
7-1 6-5 6-4 6-3
6-2 6-1 5-4 5-3
5-2 5-1 4-3 4-2
4-1 3-2 3-1 2-1这些都是10以内的减法算式
10-9 10-8 10-7 10-6
10-5 10-4 10-3 10-2
10-1 9-8 9-7 9-6
9-5 9-4 9-3 9-2
9-1 8-7 8-6 8-4
8-3 8-2 8-1 7-6
7-5 7-4 7-3 7-2
7-1 6-5 6-4 6-3
6-2 6-1 5-4 5-3
5-2 5-1 4-3 4-2
4-1 3-2 3-1 2-1这些都是10以内的减法算式
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