291. 2,6,13,39,15,45,23,( )
A.46 B.66 C.68 D.69
解析:两个一组,组内等比为3
292. √33,√11,√55,()
A.√56B.2√66C.3√66D.√66
解析:都是11 的倍数,选D
293. 1,11,121,1331,?
A.14441 B.14141 C.14641 D.15551
解析:错位相加,选C
294. 10 ,9,17,50,( )
A.69 B.110 C.154 D.199
解析:10×1-1=9,
9×2-1=17,
17×3-1=50,
50×4-1=199
295. 5,5,14,38,87,( )
A.167 B.168 C.169 D.170
解析:相差:0,9,24,49
1^2-1
3^1
5^2-1
7^2
9^2-1
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