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题型：单选题 题类：常考题 难易度：容易
一年级 20以内的退位减法816
4 × 1 = 3 × 2 = 6 × 2 = 1 × 8 =
4 + 1 = 3 + 2 = 6 + 2 = 1 + 8 =
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