1.17, 29, 43, 61, 87, ( )
A.167 B.115 C.259 D.129
2.1, 11, 31, 512, 196, ( )
A.9999 B.999 C.888 D.8888
3.1/3,1,9,243,( )
A.19683 B.19785 C.19827 D.19869
4.2,1,6,14,40,108,( )
A.288 B.296 C.304 D.312
5.3, 10,31,94,( ),850
A.250 B.270 C.282 D.283
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1.【解析】D.等差數(shù)列變式:
2.【解析】D.數(shù)列各項(xiàng)的各位數(shù)字之和分別為1,2,4,8,16,(32),構(gòu)成等比數(shù)列,只有D項(xiàng)各位數(shù)字之和為32,當(dāng)選。
3.【解析】A.作商數(shù)列。
4.【解析】B.遞推數(shù)列,遞推規(guī)律為:后一項(xiàng)=前兩項(xiàng)之和×2.因此,未知項(xiàng)為(40+108)×2=296.
5.【解析】D.前一項(xiàng)×3+1=后一項(xiàng),94×3+1=(283),(283)×3+1=850.