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0,3,9,21,(),93A.40 B.45 C.36 D.38
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3,4, 9, 12, 15, (), 21, 108。A.20 B.24 C.36 D.18
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O,3,9,21,(),93 A.40 B.45C.36 D.38
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0,2,6,14,(),62。A.40B.36C.30 D.38
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-9.1,3.2,13.2,21.4,27.8,()。A.30.16B.39.72C.36.32 D.31.32
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把7个不能区分的苹果放到3个不同的盘子里(允许有空盘),有多少种不同的放法?A.21 B.18 C.36 D.38
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3,4,9,12,15,(),21,108。A.20 B.24 C.36 D.18