专项强化练习

1.3,9,6,9,27,(),27

A.15 B.18

C.24 D.30

2.2,3,10,15,26,()

A.32 B.35

C.38 D.42

3.64,48,36,27,,()

A.B.

C.D.

4.0,1,1,2,3,(),22

A.5 B.7

C.9 D.11

5.257,178,259,173,261,168,263,()

A.275 B.279

C.164 D.163

6.,()

A.B.

C.0 D.

7.2/3,2/5,2/7,2/9,()

A.3/9 B.4/9

C.1/5 D.2/11

8.-10,30,-50,70,()

A.90 B.

C.-90 D.1

9.17,26,37,50,()

A.63 B.61

C.67 D.65

10.,()

A.B.

C.D.

11.3,15,35,63,99,()

A.143 B.145

C.147 D.149

12.1,2,6,15,31,()

A.45 B.50

C.52 D.56

13.4,11,30,67,()

A.126 B.127

C.128 D.129

14.0.5,2,,8,()

A.12.5 B.

C.D.16

15.3,18,60,147,()

A.297 B.300

C.303 D.307

16.1,3,5,11,21,()

A.33 B.41

C.43 D.53

17.22,35,56,90,(),234

A.162 B.156

C.148 D.145

18.3,4,6,9,(),18

A.11 B.13

C.15 D.17

19.60,30,20,15,12,()

A.10 B.8

C.6 D.4

20.243,217,206,197,171,(),151

A.160 B.158

C.162 D.156

21.1,4,27,256,()

A.289 B.1024

C.3125 D.512

22.8,48,120,224,360,()

A.528 B.562

C.626 D.682

23.2,12,36,80,()

A.100 B.125

C.150 D.175

24.,4,()

A.B.8

C.16 D.32

25.64,24,44,34,39,()

A.20 B.32

C.36.5 D.19

26.8,16,25,35,47,()

A.58 B.61

C.65 D.81

27.已知数列,……那么是第()项。

A.9 B.10

C.11 D.12

28.2,3,7,16,65,321,()

A.4546 B.4548

C.4542 D.4544