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题型:单选题 题类:常考题 难易度:普通
20以内的进位加法和退位减法528(10题)
5+8={#blank#}1{#/blank#}
8 + 4 = 7 + 5 = 7 + 6 = 7 + 8 = 6 + 8 =
5 + 7 = 6 + 7 = 8 + 7 = 7 + 7 = 7 + 9 =
□+□=□+□=□+□
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