题型:填空题
题类:常考题
难易度:普通
20以内的进位加法和退位减法509(10题)
举一反三
9+ | 1 | 3 | 6 | 4 | 8 | 5 | 2 | 7 | 10 | 9 | 0 |
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(从左到右依次填写)