题型:填空题 题类:常考题 难易度:容易
20以内的进位加法和退位减法487(10题)
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7 | 3 | 2 | 4 | 9 | 9 | 6 | 8 | |
6 | 9 | 8 | 7 | 2 | 9 | 6 | 5 | |
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