134, 68, 36, 21,( )A.18 B.14.5 C.12 D

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问题 134, 68, 36, 21,( )A.18B.14.5C.12D.9

选项 A.18
B.14.5
C.12
D.9

答案 B

解析 134÷2+1=67+1=68,68÷2+2=34+2=36,36÷2+3=18+3=21,21÷2+4=14.5。故选B。
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