3, , 4, , , ( )
2023-06-09
A. B.7 C.6 D.
参考答案:B
参考答案:B
由于3=,4=,则根号内数字构成的数列具有如下规律:
9 11 16 24 35 (49)
作差(后项减前项)
2 5 8 11 (14) 公差为3的等差数列
则可得未知项根号内的数字为49,未知项为=7。
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