3,2,4,7,10,18,()。
A.12
B.19
C.25
D.27
2023-05-27
参考答案:D
观察该数列可发现如下规律:3 + 2-1 = 4;2 + 4 + 1 = 7;4 + 7 -1 = 10;7 + 10 + 1 = 18;其中-1,1,-1,1为摆动数列,则空缺项应为10 + 18 - 1 = 27。因此,本题正确答案为D。
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2023-05-27
观察该数列可发现如下规律:3 + 2-1 = 4;2 + 4 + 1 = 7;4 + 7 -1 = 10;7 + 10 + 1 = 18;其中-1,1,-1,1为摆动数列,则空缺项应为10 + 18 - 1 = 27。因此,本题正确答案为D。
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