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51 + 20 = (a)
47 - 19 = (a)
25 + 25 = (a)
63 - 20 = (a)
47 是单数 还是 双数?
单数
双数
12 + 12 =?答案是单数 还是 双数?
53 - 13 = ?答案是单数 还是 双数?
14 + 29 = ? (a)
63 - 24 = ? (a)
26 + 84 = ? (a)
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