15,16,25,9,81,()A.36 B.39 C.49 D.54

admin2020-12-24  1

问题 15,16,25,9,81,()

选项 A.36
B.39
C.49
D.54

答案C

解析每项各位相加=>6,7,7,9,9,12 分3 组=>(6,7),(7,9),(9,12)每组差为1,2,3 等差
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