题型：解决问题 题类：常考题 难易度：普通
一年级 20以内的退位减法756
16 | 13 | 10 | 9 | 12 | 11 | 14 | 8 | 7 | 6 |
3 | 6 | 9 | 7 | 2 | 8 | 5 | 6 | 5 | 3 |
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