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
4. 32,48,40,44,42,()
A.43 B.45 C.47 D.49
5. 1,8,20,42,79,()
A.126 B.128 C.132 D.136
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1.【解析】D。典型等比数列,公比为3/4。
2.【解析】B。平方数列变式,各数分别为12+1,22-1,32+1,42-1,52+1,62-1
3.【解析】B。二级等差数列,相邻两项的差为23,29,35,23,29,(35)
4.【解析】A。二级等差数列变式,相邻两项的差为等比数列16,-8,4,-2,(1)
5.【解析】D。三级等差数列,相邻两项的差为7,12,22,37,(57)