1.64,48,36,27,81/4,()
A.97/6 B.123/38 C.179/12 D.243/16
2. 2,3,10,15,26,()
A.32 B.35 C.38 D.42
3. 39,62,91,126,149,178,()
A.205 B.213 C.221 D.226
参考答案与解析:
1. D【解析】典型等比数列,公比为3/4。
2. B【解析】平方数列变式,各数分别为1^2+1,2^2-1,3^2+1,4^2-1,5^2+1,6^2-1
3. B【解析】二级等差数列,相邻两项的差为23,29,35,23,29,(35)